Overturn Citizens United

• Democracy is for People
• Move to Amend (the U.S. Constitution)
• WolfPAC - similar to Move to Amend, but focused on the state level
• Free Speech for People
• Reclaim Democracy
• Stop Citizens United (Facebook page)

Public Campaign Financing

• Public Campaign
• United Re:public - runs the represent.us campaign to pass the American Anti-Corruption Act
• Issue One
• Rootstrikers

Campaign Finance Disclosure

• Campaign Legal Center

Free air-time for candidates

• Campaign Legal Center's "Our Democracy, Our Airwaves" Campaign (defunct, but archived)
• Statutes and Rules on Political Advertising

Instant Run-off Voting (IRV) / Ranked Choice Voting

• Center for Voting and Democracy
• InstantRunoff.com
• DemoChoice (make your own IRV Poll here)

Easier ballot access for third parties

• Ballot Access News

Open debates

• Open Debates

Binding None-of-the-Above option

• Voters for None-of-the-Above

Voter Protection (Voter ID, Voter Purges, Voter Suppression, etc.)

• Campaign Legal Center
• Center for Voting and Democracy: Right to Vote Amendment
• Demos: Civic Engagement
• Demos: Voting Rights and Voter Registration
• Project Vote
  • Voter ID
  • Voter Intimidation and Election Challengers
  • Voter Roll Purges and Voter Caging
  • No Match, No Vote
  • Provisional Ballots
• Greg Palast's investigative journalism
  • The Secret Lists that Swiped the Senate
  • 3.5 Million Voters Threatened with Purge
  • Ballot Bandits book

Voting machine reform (no more hackable, private machines made by Republican-connected companies!)

• Verified Voting
• Black Box Voting
• National Election Integrity Coalition
• Voters Unite!
• Election Defense Alliance
• Where's the Paper?
• E-Voting Experts
• Election Reform Network
• Books:
  • VoteScam
  • CODE RED: Computerized Election Theft and The New American Century

Public Agency Registration ("Motor Voter")

• Project Vote

Online Voter Registration

• Project Vote: Paperless Voter Registration and Online Voter Registration

Permanent Portable Voter Registration

• Project Vote:
  • Permanent Portable Voter Registration
  • Interstate Compacts

Universal Voter Registration

• Center for Voting and Democracy

Election Day Registration

• Project Vote: Same Day Registration
• Center for Voting and Democracy
• Demos: Election Day Registration in Hawaii
• Senator Sanders calls for Voting Holiday

Early Voting and No-Excuse Absentee Voting

• Project Vote:
  • Early Voting
  • Convenience Voting by Mail
• Center for Voting and Democracy
• National Conference of State Legislatures

Prisoner / Felon Voting Rights

• Project Vote
• Sentencing Project: Felony Disenfranchisement
• Felon Voting Rights Chart
• Rock the Vote's info on Felon Voting Rights

Lowering Voting Age

• National Youth Rights Association
  • 2013: Takoma Park, MD became first place in U.S. to lower voting age to 16
• Project Vote

Congressional Representation for DC

• DC Vote

Binding initiative and referendum

• Ballot Initiative Strategy Center
• Initiative & Referendum Institute

Redistricting reform (ending gerrymandered districts)

• Center for Voting and Democracy
• Demos: Redistricting & Representation

Proportional representation

• Center for Voting and Democracy

Electoral College Circumvention

• National Popular Vote
• Center for Voting and Democracy

Voter education materials

• California has a great model at voterguide.sos.ca.gov

Term Limits

• U.S. Term Limits
• Citizens for Term Limits

Compulsory Voting

• We're not aware of anyone in the U.S. seriously advocating for this, but 22 other countries have it, and in combination with other election reforms, like a National Voting Holiday and a binding None-of-the-Above option, it could actually be worth exploring. See Wikipedia's page on Compulsory voting.