With the GOP presidential nomination all but wrapped up, frontrunner Mitt Romney's team is turning its attention to picking running mate. Who's on Romney's short list? ABC News' Jon Karl offers up his predictions:

Top Tier: Rob Portman, Marco Rubio, Jeb Bush

Second Tier: Chris Christie, Mitch Daniels, Bob McDonnell, Paul Ryan

Top women candidates: Kelly Ayotte, Mary Fallin, Nikki Haley, Susana Martinez

Wildcard: Gen. David Petraeus

Others who will get a look: John Thune, Jim DeMint, Tim Pawlenty

Who else would you add to the list?