One of these is FairVote, which provides a long list of "endorsers" of IRV, including President Obama, Senator John McCain, policy analyst Michael E. Arth, the Green and Libertarian parties, a dozen state chapters of the League of Women Voters, four state chapters of the Democratic Party, the Republican party of Alaska, and many others.
Important players in the electoral reform movement include Virginia resident and former Libertarian Party national chair Bill Redpath and others associated with FairVote.