John King, along with Arizona State University students playing the parts of Ron Paul, Rick Santorum, Mitt Romney, and Newt Gingrich, is doing a run-through today ahead of tonight’s GOP debate in Mesa, Arizona. This is the 20th, and likely final primary debate. The first face-off on Fox News last May, also featured four candidates — only one of whom, Ron Paul, is still in the race. The other attendees were Herman Cain, Gary Johnson and Tim Pawlenty.

Tonight’s debate will feature the candidates at a table instead of podiums. Playbook reports CNN last used this set-up for a GOP debate on Jan. 30, 2008, at the Reagan Library. Sitting at the table then were candidates John McCain, Mike Huckabee, Romney and Paul.

The Arizona debate airs on CNN at 8pmET.

During Iowa Caucus coverage last night, just after 9pmET, MSNBC’s Rachel Maddow who was leading the network’s coverage reported that one-time GOP presidential candidate Gary Johnson who dropped out of the race to run as a Libertarian candidate, “has dropped his bid for the Libertarian nomination and instead will be endorsing Ron Paul.”

“That’s fascinating,” chimed in Chris Matthews. And it would be. If it were true.

Five minutes later, Maddow corrected her report, calling it “a hoax. Sorry. That’ll happen.” Added MSNBC’s Lawrence O’Donnell, “That will happen. Live television, ladies and gentlemen.”

Tomorrow’s republican presidential candidates debate in Orlando is being super-sized. The debate, which was to run 1 hour 45 minutes will now be 2 hours since former New Mexico governor Gary Johnson made the cut. Moderator Bret Baier, is joined by Megyn Kelly, Chris Wallace and Shannon Bream for the debate which begins at 9pmET. More than 17,000 questions have been submitted to Fox News’s YouTube Channel, in both video and text form.