Florida Gov. Charlie Crist's Senate campaign seized on the Republicans' financial commitment to GOP candidate Marco Rubio and incorporated it into a fundraising push.

The National Republican Senatorial Committee on Tuesday promised to invest $2.5 million in TV ads backing Rubio.

"That's just another 2.5 million reasons why Marco Rubio will be a lockstep vote for the political party bosses and Washington special interests that got America into this mess in the first place," Dane Eagle, Crist's finance director, wrote in an e-mail. "The Rubio campaign has already spent millions of dollars distorting the governor's record, and make no mistake, there's more to come —more of the same old cynical, attack politics that our opponents would bring to the United States Senate if they were elected."

A spokesman for Rubio's camp noted that Crist has also accepted donations from so-called "party bosses."

At the start of August, Crist had more cash on hand than Rubio — $8 million to $4.5 million — and Democrat Kendrick Meek, who had $2.5 million. But the governor, running as an independent, remains at a disadvantage without a party's infrastructure behind him. 

--Updated at 3:27 p.m.