Former Republican vice presidential candidate Sarah Palin isn't convinced that former Massachusetts Gov. Mitt Romney is the best presidential candidate because she's not sure he will "err on the side of conservatism."

Fox News host Chris Wallace on Sunday asked Palin if Romney was an "instinctive conservative."

"I trust that his idea of conservatism is evolving," Palin replied. "I base this on a pretty moderate past that he has had -- in some case even cases, a liberal past. Here, he agreed with mandating on the state level what his constituents needed to be provided, needed to purchase in the way of health care under Romneycare, which, of course, was the precursor to Obamaneycare -- to Obamacare."

"But what I want to see is that candidate -- and I believe that most voters in the GOP and independents, we will want to see that candidate who we can trust, who will just inherently, instinctively turn right, always err on the side of conservatism, which means smaller, smarter government, more empowerment for the individual, for the private sector."

She added: "I am not convinced, and I don't think that the majority of GOP and independent voters are convinced."