Majority PAC, founded by top Democratic advisers, aims to defend the Democratic majority in the Senate. Over the 2012 campaign cycle, it has spent $14.2 million and raised $14.6 million, as of Oct. 4. This super PAC has not spent any money for or against presidential candidates.
The left-leaning equivalent of American Crossroads, Majority PAC is run by top Democrats. The group's co-founder is Susan McCue, former chief of staff to Senate majority leader Harry Reid (D) of Nevada. Veterans of the Clinton administration and the presidential campaigns of Vice President Al Gore, Sen. John Kerry, and Obama serve in key leadership roles.
The PAC receives its top donations from unions, lawyers, and financiers. Its No. 1 donor is is James Simons, a billionaire hedge fund manager, who gave $1.5 million. Another major source of funding is the labor movement, which contributed more than $3.2 million, including $1 million from the Laborers' International Union of North America (LIUNA), $750,000 from the International Union of Operating Engineers (IUOE), and $500,000 from the American Federation of State, County and Municipal Employees (AFSCME).
Majority PAC has targeted 11 Republicans running for Senate and supported four Democrats. Their top target is Virginia's US Senate race, where the super PAC has spent more than $1 million to elect former Gov. Tim Kaine (D) and some $2.6 million to defeat his GOP rival, former Sen. George Allen, who also served as governor of Virginia from 1994 to 1998.