Aren't these just polls of the segment that is willing to suffer through the call? Doesn't that naturally make them more polar in nature, because all the pragmatic folks are busy with real life to care?
Most seem to be political ads in disguise, where the questions are very leading, to the point of being comical. "Do you support Barack Obama's view's to immigration, which may allow potentially dangerous illegal aliens to stay indefinitely in America, and TAKE YOUR JOB!?"
I live in a pretty conservative area, and it seems like these polls are just trying to make sure all the old people get riled up to go vote.
The most famous example is probably from George W. Bush's primary campaign against John McCain (who had previously adopted a Bengali girl). I'll quote from Wikipedia:
> Voters in South Carolina reportedly were asked "Would you be more likely or less likely to vote for John McCain for president if you knew he had fathered an illegitimate black child?"