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Republicans are aiming to deal Democrats a decisive blow in the closing days of the campaign for control of the U.S. Senate by pouring millions of dollars into three states -- Colorado, Iowa and North Carolina -- that favor Democrats.

These states are the Democratic firewall, says Jennifer Duffy, a Senate analyst at the nonpartisan Cook Political Report in Washington. Theyve got to win most if not all of those.

Democrats are responding to the advertising blitz with spending of their own, aiming to win over voters that are more closely aligned with their party than in most of the other competitive states.

American Crossroads, which backs Republicans, boosted this months advertising in Iowa and Colorado, both of which President Barack Obama carried in 2008 and 2012. Since Oct. 14, Crossroads, co-founded by Republican strategist Karl Rove, has spent $1.2 million on ads in Iowa and $3.5 million in Colorado.

The Democratic Partys senatorial campaign committee said it will spend the most on the three states in the home stretch before the Nov. 4 election. Both parties have reserved extensive air time for ads in North Carolina.

That continues a pattern in which independent groups have spent at least $10 million more in Iowa, Colorado and North Carolina during this election than anywhere else. At least 10 states are seen as battlegrounds in the fight to win the Senate majority.

U.S. Representative Tom Cotton takes questions from supporters at a Republican headquarters office in Hot Springs, Arkansas, on April 26, 2014. Close

U.S. Representative Tom Cotton takes questions from supporters at a Republican... Read More

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U.S. Representative Tom Cotton takes questions from supporters at a Republican headquarters office in Hot Springs, Arkansas, on April 26, 2014.

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Election-Cash Blitz Aims at 3 States With Senate At Stake