Florida Republicans are trying to damage Charlie Crist’s credibility -- as the politician prepares to speak at Democratic National Convention this week -- with a new ad focusing on the former governor’s Republican past.
As first reported by CNN, the commercial, called "How Conservative Are You, Charlie?" is running on cable channels in Florida through Friday. It features old clips of Crist praising President George W. Bush and Sarah Palin, saying he was "about as conservative as you can get."
"If many Democrats thought Clint Eastwood's speech was a bit odd, wait till they see Charlie Crist – a man who has built his career bashing virtually everything President Obama and the Democrats stand for, including the President's spending programs and ObamaCare – debate himself," Republican Party of Florida Chairman Lenny Curry wrote in a statement.
"Charlie Crist may try to use the Democrats' national convention as his latest attempt to shed his political skin, but the RPOF intends to make sure the people of Florida and the nation remember his words and record," he added.
Last week, Crist endorsed President Barack Obama for reelection.
“The truth is that the [Republican] party has failed to demonstrate the kind of leadership or seriousness voters deserve.” he wrote in an op-ed in the Tampa Bay Times.
Crist has been fighting off gay rumors for years. This past June, the former governor of Florida was accused of paying two men to hide gay affairs.
In 2009, Crist was the subject of a documentary called "Outrage," which purports politicians who are not out and are against LGBT rights.
WATCH: The Republican Party of Florida’s negative ad on Charlie Crist.