A brief history of convention crossover speeches

Charlie Crist and Artur Davis belong to the 2012 class of convention renegades — politicians who have spurned their former political parties to appear at rival nominating conventions....

Crist and Davis each stand out this year. But this isn’t the first time a high-profile pol has disavowed his or her former affiliation on the national convention stage. Here’s a look back through history at a handful of memorable defectors:

* Joesph Lieberman, 2008: Declaring “country matters more than party,” Lieberman, who eight years prior was the Democratic vice presidential nominee, delivered a defense of Arizona Sen. John McCain’s record at the GOP convention in St. Paul, Minn. Lieberman, a longtime friend of McCain’s and a senator from Connecticut lost in the Democratic Senate primary two years prior, but won reelection as an independent in the general election....