Get your wonk on, political junkies. University of Virginia professor Larry J. Sabato offers up a smart look at the hottest primaries leading up to November's midterm elections in Politico Magazine. Sabato's take is whether the Tea Party can sustain its power. His conclusion on the primaries: "Probably the most far-reaching lesson will be taught by the five Tea Party challenges to GOP Senate incumbents remaining in Kansas, Kentucky, Mississippi, South Carolina and Tennessee. Maybe a couple more Republican senators will be thrown overboard, proving the durability of the party's...