While discussing John McCain's new ad aimed at Latino voters, Sen. Mel Martinez (R-FL) made the point -- a number of times -- that McCain's stance on comprehensive immigration reform has not wavered throughout the campaign process, despite what Barack Obama has said.

"Senator McCain valiantly fought the good fight at the height of the primary, at whatever political risk," Martinez said this morning on a conference call with reporters. Later in the call, he maintained that McCain backed comprehensive immigration reform "during the primary, he's for it now, and he will be for it when he's president."

The Florida senator went on to accuse Obama of attempting to place a poison pill amendment in the immigration legislation last year; Martinez noted that had the amendment passed (it failed on a 55-42 vote), it "would have meant the end of immigration reform."

"When it counted, Senator Obama was not there, but he was playing to the special interests that at that time appeared to be who he needed to play to to advance his own personal political interests," Martinez said. "Today, he's playing to a different group and he's singing a different song to continue to advance his political interests."

Martinez said he wouldn't let Obama "trash" McCain's immigration record, an apparent reference to Obama's remarks Tuesday at the LULAC conference. In his speech to the Latino group, Obama noted McCain's statement at a January 30 Republican primary debate that he wouldn't vote for his own immigration bill.