Washington (CNN) - A top independent conservative group is going up with a new round of television commercials in five states in the battle for control of the Senate.
Crossroads GPS confirms to CNN that it will spend $4.2 million to run TV ads in Missouri, Montana, North Dakota, Nevada and Virginia. The group, which was co-founded by Karl Rove, says the spots start running Wednesday and will air through next Tuesday.
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Crossroads GPS is the sister organization to American Crossroads, the independent super PAC that backs GOP causes and candidates. The groups have spent tens of millions of dollars to run advocacy ads in the race for the White House that are critical of President Barack Obama and in support of GOP lawmakers and candidates in crucial Senate contests.
Four of the states where the ads will run–Missouri, Montana, North Dakota, and Virginia–are top takeover targets for the GOP, as they try to win control of the Senate from the Democrats in the November election.
The Democratic Senatorial Campaign Committee was quick to respond.
"Karl Rove is spending millions propping up George Allen, Dean Heller, Denny Rehberg, Rick Berg, John Brunner, Sarah Steelman, and Todd Akin because he knows that these Republicans will be a rubber stamp for the special interests that are lining Rove's pockets. What's worse is that Rove is blatantly thumbing his nose at election laws and allowing billionaires and corporate special interests to avoid federal election law with their anonymous, shadowy donations," said DSCC spokesman Matt Canter, in a statement.
Politico first reported on the Crossroads ad buy.
The Democrats currently hold a 53-47 advantage in the Senate, but they are defending 23 of the 33 seats up for grabs this year, including the seats of two independents who caucus with the Democrats.