WASHINGTON--CNN's John King reprises his role as debate moderator on Wednesday, when the four GOP presidential rivals face off in another debate at 8 p.m. EST from Mesa, Arizona. The last debate seems ages ago--Jan. 26 in Florida.

This is the last debate before next Tuesday's Arizona and Michigan primaries, the March 3 caucus in Washington State and "Super Tuesday" on March 6, when ten states hold a primary or caucus.

From CNN: "All four of the leading Republican presidential contenders will participate in Wednesday's debate: former House Speaker Newt Gingrich, Texas Rep. Ron Paul, former Massachusetts Gov. Mitt Romney and former Pennsylvania Sen. Rick Santorum. In addition to questions posed to the candidates by King and Arizona Republicans in the audience, the network will solicit questions and comments submitted in real-time from CNN.com, the CNN Politics fan page on Facebook and by using the #CNNDebate hashtag on Twitter."