If not Hillary, name your candidate to replace Biden:
Sandra Fluke
Van Jones
Barny Frank
Kim Kardashian
Michael Moore
Or Dick Cheney. It'd put Wyoming in play, and force Romney to spend time and money there to defend his turf.
Or former Senator Craig from Idaho (Republican). It'd shore up his base in the GLBT community, and again force Romney to change his strategy to compensate.
If not Hillary, name your candidate to replace Biden:
Sandra Fluke
Van Jones
Barny Frank
Kim Kardashian
Michael Moore
Bill Mahr
Sean Penn
George Clooney
Jessica Sarah Parker
Deval Patrick (current governor of MA)