The prospect of a brokered Republican convention has reared its head — with the re-emergence of conservative lightning rod Sarah Palin as a GOP savior — as the controversial Alaskan said she’d be willing to “help” if her party can’t choose a nominee ahead of the August rubber- stamp event. But even with the rollicking Republican primary roller coaster looking more like a trainwreck, political experts and players are split over the likelihood of a late-summer nailbiter. Sean Trende of RealClearPolitics.com said that if the current trend of stark regional divides continues — with Mitt Romney taking more moderate states,...