While I would imagine this is probably true, it's just another poll and I don't trust the results of this one any more that the ones others like to show as "fact".
Common sense tells us no people like to be oppressed. But at the same time I'm sure there are a lot of Iranians who still have a strong dislike of the US. It would be nice if the majority there were supportive of the US and could see something positive coming out of what's going on in the Middle East, but I take things like these polls with a big grain of salt.