Greed.
Greed is not wanting to keep what you earn, greed is wanting to keep what others earn.
Our politicians are just too happy to oblige.
I don't think they can. Unless the definition of "conservative" used in presenting the poll results is skewed such that neither you nor I would consider some of those respondents to be conservatives if we spoke with them.
For example, how many Leftists would respond affirmatively to the question, "Would YOU like for YOUR taxes to be lower?"
Most of them would. After all, Leftists are not in favor of higher taxes, they're just in favor of OTHER PEOPLE paying higher taxes -- rich people (which they never consider themselves no matter what they themselves make).
I could think of a couple more examples, but, in short, I don't trust the results of the poll. I don't know the questions asked, the answers given, or how the poll defined people as "conservative" or not.