Spoiler, GOP backstabber Mitt Romney (and his BOTs):
"Never, not once, has anyone criticized me for being a 'flip flop'." 
I think it’s the definition of ‘flip-flopper’ that needs to be clarified.
I wouldn’t call Reagan a flip-flopper on the issue of abortion, and IIRC he ran for President very few years after that. Would you call RR a flip-flopper?
There are a half dozen very good reasons I wouldn’t vote for Romney, but flip-flopper isn’t one of them.
Spoiler, GOP backstabber Mitt Romney (and his BOTs):
"Never, not once, has anyone criticized me for being a 'flip flop'."