Opinion--The term 'RINO' stands for 'Republican in Name Only.' It is somewhat of a misnomer due to the fact that whoever wants to belong to a political party can do so, regardless of whether or not they agree with the party's platform and philosophy.
No one is suggesting that Mitt Romney is not a Republican. He is. But so are Susan Collins, Olympia Snowe, Lisa Murkowski, and Scott Brown, all of whom have proved by their votes that they are more in line with liberals and the ideals of the Democratic Party than with conservatives.
The reason, thus, that such persons are called RINOS is that it is a moniker that has stuck, in reference to those Republicans who can be counted on to oppose conservative principles.
Thus, Mitt is a RINO. And he pushed for and got a program in Massachusetts, 'RomneyCare,' that one and all among political insiders agree is the blueprint for ObamaCare.
But that isn't Mitt's only problem.