The Democratic Congressional Campaign Committee is launching radio and Web ads blasting 21 House Republicans over their refusal to agree to allow a vote on extending middle-class tax cuts. 

With the George W. Bush tax cuts set to expire at the end of the year, Democrats and President Obama want to freeze the current rates for those with income under $250,000 per year but let them expire for those making more. The Senate has approved a bill that would do that, but the measure does not have enough support to get a vote in the Republican-controlled House.

Obama has said that Republicans are holding middle-class tax cuts "hostage" in favor of keeping rates low for the wealthy. Republicans want more specific spending cuts included in a deal.

The radio or Web ads will target these House members, whom the DCCC called vulnerable: Rick Crawford, Tim Griffin, Jeff Denham, Buck McKeon Gary Miller, Steve Southerland, Dan Webster, Tom Latham, John Fleming, John Kline, Erik Paulsen, Lee Terry, Joe Heck, Chris Gibson, Tom Reed, Bill Johnson, Mike Fitzpatrick, Kristi Noem, Frank Wolf, Congresswoman Jaime Herrera Beutler and David McKinley. 

The National Republican Congressional Committee responded to the DCCC ads on Wednesday, noting footage from France was used in the Web ads. 

"But perhaps it's fitting in that the Democrats’ insistence on going over the fiscal cliff will send our unemployment rate closer to the French levels of nearly 11 percent," an NRCC blog post said. 

The Republican-backing super PAC Crossroads GPS launched radio ads Tuesday targeting five vulnerable Democratic senators, saying that Obama's plan means "massive tax increases."