TAMPA, Fla.—Herman Cain is thinking about running for president, even though it’s likely you’ve never heard of him. And that’s OK — at least right now — for the black Republican who has become a sought after speaker on the Tea Party circuit. The former CEO of Godfather’s Pizza says he’s going to build a grassroots coalition of supporters from the bottom up, if he decides to run, and if the Tea Party movement in 2010 is any indication, Republicans won’t be looking to nominate a household name for president in 2012. “They’re ready for a non-establishment candidate,” Cain, casually...