Mark is right: Space polls are worthless
I've never seen a space poll that I thought had any value (this is for both pro- and anti-space polls). It's too easy to cast a space exploration poll as a push poll, e.g. Are you willing to spend $60/year on Space Exploration? The truth is the typical American is almost clueless about Space Exploration. He supports it only because he thinks it's cool (entertained by it) and doesn't see much personal sacrifice in it.
Gary