Published: Aug 29, 2012 2:16 PM EDT

TAMPA, Fla. (AP) - Florida Sen. Marco Rubio says he will use his speech at the Republican National Convention to highlight the choice between President Barack Obama and GOP nominee Mitt Romney.
    
Rubio said Wednesday that his speech will point out the differing views that Obama and Romney have on business and the role of government in helping the economy.
    
Rubio was also asked about former Florida Gov. Charlie Crist's decision to endorse Obama. He said Crist can endorse whoever he wants, but then he joked that Crist was running out of parties to join.
    
Crist switched from the GOP to independent because Rubio was ahead in polls leading up to the 2010 Senate primary. Rubio then beat Crist and a Democrat in the general election.

(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)