Sure, some of them have faced off before—but tonight’s Politico/NBC News debate marks the first time new frontrunner Rick Perry will join the fray, making it what Politico calls the “first Fall Classic” for 2012 GOP presidential hopefuls. And it’s the start of a busy month as the race kicks into high gear: Two more debates are scheduled over the next three weeks, the AP notes. In light of the stagnant unemployment rate and President Obama’s jobs speech tomorrow, the economy will likely dominate the discussion. Beyond that, Politico has five things to watch: