The reason you believe that is because you have been listening to anit-Romney garbage. All of you forgot that he was a conservative Republican in a far left State. Much what he had to sign was a compromise like some of the things Bush has had to do. If Romney used his veto pen it would have no effect since the Mass Legislature is overwhelming left and far left and would have overridden anything Romney did. Even the Court dictated what he could do. He had to compromise to at least get a portion of conservatism in the mill. Wake up! Never mind, closed minds cannot be reasoned with. Take CA, total liberal and all Arnold could do is play with some of it.
So how on Earth do you think he'd advance the conservative agenda in Washington, faced with a Democratic Congress?
You may think that he just rolls over a lot, I personally think that he has no core principles. Sounds like we're not actually that far apart.