POLITICS
10/06/2010 01:15 pm ET | Updated May 25, 2011

Colorado Senate Race Becomes Election Proxy War, Liberal Group Tries To Level The Playing Field Against Crossroads GPS (VIDEO)

Colorado's U.S. Senate race has become a proxy war this election, with independent groups pouring in large sums of money to air attack ads against both candidates. With Karl Rove's behemoth Crossroads GPS and American Crossroads spending as much as many of the official party institutions, a left-leaning group is trying to even up the spending.

Campaign Money Watch, which describes itself as a nonpartisan campaign finance reform watchdog, has taken out a $750,000 media buy with an ad going after Republican Ken Buck's ethics controversies.

"Ken Buck's misconduct let an illegal gun dealer facing 37 criminal charges off the hook," the announcer says in the ad. "Now the same illegal gun dealer contributed money to Buck's campaign."

WATCH:

"Because of Ken Buck's irresponsible actions, a corrupt gun dealer got off the hook--a gun dealer who has contributed to Buck's Senate campaign," said David Donnelly, director of Campaign Money Watch, in the group's press release. "Coloradoans should wonder whether Ken Buck would let the special interests off the hook if he gets to Washington, D.C."

Campaign Money Watch's ad comes after Crossroads GPS, a nonprofit that does not need to disclose its donors, took out a $770,000 ad buy against Democrat Michael Bennet. In August, the group ran an ad attacking for his fiscal policies, saying, "Since his appointment, Bennet has voted to spend $2.5 billion every single day."

In an interview with The Huffington Post on Tuesday, House Speaker Nancy Pelosi (D-Cali.) said that the influx of money on the Republican side was making it harder for Democrats to keep the House in November and added that she hoped liberal groups would be airing ads backing their candidates.

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