[fenomas]

Negatory - the sets being compared aren't independent.

That is, the overall population is (roughly) half red and half blue. If you divide that population into groups - on whatever basis - and the largest group is 93% red, then it follows that some of the other groups are going to be mostly blue.

[ameister14]

That's only the case if you have equivalent populations and people can make only one choice, neither of which is true here.

[fenomas]

They're equivalent to a first approximation, and the numbers we're talking about are from a poll where respondents could make only one choice.