ABC’s Jon Karl takes an early stab at Romney’s VP short list.

Top Tier: Rob Portman, Marco Rubio, Jeb Bush

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

Women: Kelly Ayotte, Mary Fallin, Nikki Haley, Susana Martinez

Due to his recent penguin bite, Newt was left off the list.

Original ABC post via Political Wire.