It's all guesswork anyway. Even if the public opinion polls seem to suggest answers, people don't necessarily tell the truth about those kind of issues.

Speculating about whether more people are going to be swayed by Obama's colour of by Clinton's sex, and deciding whom to back on that basis, is a bit futile. Better to make the judgement on the basis of which one of them would make a better president, or whom you would prefer to see elected. (Not necessarily the same thing.)