Fla's former governor, a former Republican, will speak at the DNC.
State Democrats say Crist's appearance at the DNC shows the GOP has been hijacked by conservatives who won't allow bipartisan compromise.
Crist will speak at the convention tomorrow night, before President Obama accepts the nomination.
There is some belief that former Florida Governor Charlie Crist will run against Gov. Rick Scott as a Democrat in 2014.
Crist, an independent, described himself as a conservative Republican when he was in office, and praised such public servants as Sarah Palin, Jeb Bush and former President George W. Bush.
The Florida Republican Party uses those quotes in a new political ad, just in time for the Democtatic National Convention, where Crist will be one of the keynote speakers, after speaking out in support of President Barack Obama.