U.S. Rep. Joe Baca of California, shown at the 2008 Democratic National Convention, learned the power of superPACs firsthand this year, when he lost for the first time since he was elected in 1999. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

Peter G. Peterson speaks at the Fiscal Summit in Washington, D.C., last year. The event was sponsored by the Peter G. Peterson Foundation. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov

A supporter of President Barack Obama raises his arms as it is announced that Obama was re-elected during an election night watch party in Chicago. Jerome Delay/AP hide caption

itoggle caption Jerome Delay/AP

Karl Rove, former adviser to President George W. Bush, speaks last year in Corpus Christi, Texas. Rove is the chief fundraiser for the biggest outside spender this election season: the twin groups American Crossroads and Crossroads GPS. Michael Zamora/AP hide caption

itoggle caption Michael Zamora/AP

Former Virginia Gov. Tim Kaine is joined by his wife and daughter in celebrating his Senate victory over Republican George Allen. Mike Theiler/UPI /Landov hide caption

itoggle caption Mike Theiler/UPI /Landov

The Campaign to Defeat Barack Obama, a small-donor PAC, has launched a bus tour to reach conservative voters in hotly contested states, while trying to raise money to launch an anti-Obama TV ad. Yfat Yossifor/Courtesy of Mlive.com hide caption

itoggle caption Yfat Yossifor/Courtesy of Mlive.com

Costumed demonstrators on Oct. 3 in Denver, before the first presidential debate. Doug Pensinger/Getty Images hide caption

itoggle caption Doug Pensinger/Getty Images

Supporters watch Republican presidential candidate Mitt Romney speak on Friday in Abingdon, Va. Romney started off his campaign calling for big tax cuts, but has backed off that somewhat. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images