I think about
this a lot.
For example, when Priorities informed a focus group that Romney supported the Ryan budget plan — and thus championed “ending Medicare as we know it” — while also advocating tax cuts for the wealthiest Americans, the respondents simply refused to believe any politician would do such a thing.
It is a problem when you can completely accurately describe what Republicans very explicitly say they want and people will refuse to believe you and perhaps get mad at you for "lying" to them.