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| IRS990/ActivityOrMissionDesc | 0 | COMMON CAUSE IS A NONPARTISAN, GRASSROOTS ORGANIZATION DEDICATED TO UPHOLDING THE CORE VALUES OF AMERICAN DEMOCRACY. WE WORK TO ENSURE OPEN, HONEST, AND ACCOUNTABLE GOVERNMENT; TO PROMOTE EQUAL RIGHTS, OPPORTUNITY, AND REPRESENTATION FOR ALL; AND TO EMPOWER ALL PEOPLE TO MAKE THEIR VOICES HEARD AS EQUALS IN THE POLITICAL PROCESS. COMMON CAUSE WORKS ACROSS FOUR MAJOR ISSUE AREAS: VOTING AND ELECTIONS; MONEY AND POLITICS; ETHICS, TRANSPARENCY AND GOVERNMENT ACCOUNTABILITY; AND MEDIA AND DEMOCRACY. |
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| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Elizabeth MARCHANT CHIEF FINANCIAL OFFICER |
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| IRS990/Desc | 0 | Voting and elections After Illinois Gov. Bruce Rauner vetoed automatic voter registration legislation that Common Cause Illinois shepherded through the state legislature, Common Cause worked to revise the bill to address the governor's objections. The bill passed again with overwhelming bipartisan support in the spring of 2017. Responding to proposed legislation that would eliminate the Election Assistance Commission, Common Cause organized sign-on letters and encouraged state and local elections officials, military leaders and others to publish their own statements about the continuing need for the EAC. Supporters elected not to take the bill to the floor, so for now the agency is safe. Opposition from Common Cause Hawaii helped defeat a charter amendment on the November ballot in Honolulu County that would have removed the requirement of partisan balance on the county's citizen redistricting commission. We announced our opposition in a press release and an op-ed in the Honolulu Star-Advertiser. The measure was defeated by 30 percentage points. Common Cause Rhode Island successfully lobbied for passage of automatic voter registration legislation, which the governor supported. The state will be the ninth in the country to add qualified residents to the voter rolls automatically when they do business with state motor vehicle offices. Rhode Island will extend automatic registration to additional state agencies once those agencies meet state standards. |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | Lenny Mendonca |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | Chang K Park |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | Nancy Ratzan |
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| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | Tracy Westen |
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| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 87183 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 22 | 71735 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 23 | 104605 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 24 | 109076 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Vice Chair |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Treasurer/Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | BoARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | bOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | bOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | bOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | BOARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | boARD MEMBER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | President/CEO (from 6/16) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | President/CEO (until 6/16) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | Chief Financial Officer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 22 | Sr. Advisor |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 23 | VP, State Operations |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 24 | VP, Communications |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1968 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 1 |
| IRS990/FundraisingAmt | 0 | 41433 |
| IRS990/FundraisingDirectExpensesAmt | 0 | 6300 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | -1074 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 20 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 40281 |
| IRS990/GrossReceiptsAmt | 0 | 7619386 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 50675 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 19 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 6 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 60717 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 456310 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 262832 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 779859 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 46249 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 46249 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 9337 |
| IRS990/InterestGrp/TotalAmt | 0 | 9337 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 5018 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 5018 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 356537 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 387743 |
| IRS990/IRPDocumentCnt | 0 | 44 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 454998 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 1461099 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 1279179 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 1734177 |
| IRS990/LegalDomicileStateCd | 0 | DC |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 41355 |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 1 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 1 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | With offices in Washington, DC and 35 states and 998,000 supporters and activists, Common Cause works to advance democracy reforms at federal, state, and local levels, through crafting model legislation, lobbying, public engagement, and joint efforts with diverse partners across the reform community. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 92036 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 1337442 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | -1074 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | -1074 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | -6300 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | -6300 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 50675 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 50675 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 34981 |
| IRS990/NoncashContributionsAmt | 0 | 40438 |
| IRS990/NondeductibleContributionsInd | 0 | 1 |
| IRS990/NondeductibleContriDisclInd | 0 | 1 |