I suspect most pollies are to the left of how they act, they just play more conservative as that is the way the wind is seen to blow.
It wouldn't surprise me if a lot of Pubbies are actually at least socially liberal (well the more educated ones), they just play up their social conservatism to suck up to the base.
On a similar note, I wouldn't be surprised if a good number of populist Democrats are actually more "market-orientated" (not necessarily right-wing or libertarian, but like economist-wonkish) than they present themselves. The first example that springs to mind is when Hillary Clinton supported a "gas tax holiday" back in 2008 when basically zero economists did. I suspect she privately didn't support it, but her advisers told her that it polled well.