Former Alaska governor and 2008 Vice Presidential candidate Sarah Palin threw her weight behind Newt Gingrich as Republican presidential nominee Tuesday. At the same time, she coyly left open the door for her own White House run. The GOP firebrand said she voted for Newt in the caucus/primary in Alaska, one of 10 states to cast ballots yesterday (see THG's full Super Tuesday results). "I will tell you who I voted for... the cheerful one, ...