• Gary Johnson

The third Republican presidential debate in 15 days takes place Thursday night in Orlando, and you can bet that the majority of the action should revolve around front-runners Rick Perry and Mitt Romney, with plenty of time allotted to debate Social Security, which Romney previewed at an event in Miami on Wednesday.

There will be a couple of changes from last week's Tea Party forum in Tampa, starting with the fact that it's not being co-sponsored with the Tea Party.

There will also be a new guy in a suit on stage – former New Mexico Governor Gary Johnson, who actually appeared in first televised debate of the season – back in the spring, when neither Romney, Perry, Bachmann or Jon Huntsman had deigned to get into the race yet.