Republicans are making a multimillion-dollar investment in Florida Senate candidate Marco Rubio (R).

The National Republican Senatorial Committee (NRSC) announced Wednesday it plans to spend $2.5 million on TV advertising for Rubio. The committee recently pledged $3.4 million to Illinois Senate candidate Mark Kirk (R).

"This funding demonstrates a continued commitment to Marco Rubio's candidacy and our confidence that he will be Florida's next U.S. senator," NRSC spokeswoman Amber Marchand told the St. Petersburg Times. "What remains to be seen is whether the national Democrats will make the same commitment to Congressman Kendrick Meek's campaign."

Democrats have recently been more focused on the third candidate in the race, Gov. Charlie Crist.

Florida-based strategist Steve Schale wrote a widely circulated blog post Tuesday arguing the governor has no path to victory. "Rubio is limiting him to 20 percent of the Republican vote. If Rubio keeps him at 20 percent of the GOP vote, Crist needs to get 45 percent of the Democratic vote in order to win, and according to the latest PPP poll, Crist is only at 38 percent today with Democrats," Schale wrote.

The memo came a day after the NRSC circulated a letter mocking Crist and asking for its $10,000 donation to be returned.