If Republicans want to win then I'd pick Brian Sandoval/Susana Martinez it's shocking their names aren't even in consideration for 2016. Their perfect young, Latino, moderate, popular in blue states I don't even see Clinton topping this ticket.
I don't think it helps that they're pro-choice (Sandoval definitely is).
Still it's only 2014 they could just be biding their time for all we know.
Of course and that's why this is only a fantasy realistically they'll never be at the top of the ticket but Sandoval being pro-choice would dismantle the War on Women rhetoric and make it easier for Republicans to win.