Leon Penetta is a perfect candidate for the Dems in 2016.
Wow, its funny I never even thought of him before. He would be a good candidate. He seems to have good crossover support based on his confirmation vote.
In addition here is my list:
Gov. Cuomo
Sen. Gillibrand (I'd like to see her run, but I think she would be more likely to be a cabinet member)
Gov. O'Malley
Gov. Lynch
VP Biden (Lol, I don't know why he would, but a few weeks ago he told us not to count him out for 2012)
Sen. Warner (Although, I think his time was 2008)
Sen. Klobuchar
Gov. Schweitzer