Chris Christie and Marco Rubio have burned that bridge as far as party clarity, cohesion. Jeb Bush is milqtoast and is chained at the ankle to his father and brother. Paul has his own set of links and chains. Cruz is a flash in the pan. Walker will (unfairly) be just another white guy.
And Sarah Palin has been put on a pedestal as a caricature.
As if Hillary Clinton has no baggage. Who would you prefer to run?