Jeb Bush’s decision not to endorse Mitt Romney before Tuesday primary raises three possibilities about the former Florida governor’s role in the 2012 presidential election.

At the moment, he is playing no role at all.  There had been considerable speculation he would publicly back Romney, as his father, former President George H.W. Bush, has.  And Romney has made a strenuous effort to recruit Jeb Bush, whom Jeff Zeleny of the New York Times called “the biggest catch of all” in the presidential race.