While I agree a candadate should be judged by merit, stance, and ability I also know that 50% of it is lies or at least "saying what needs to be said". Now the reason i chose "i dont know" is even if a woman, or black, or any minority is lesser of the candatates as far as thier stances on issues i may still vote on them based on breaking the status quo, how many people would not vote because "we've never done that" mentality. Even if they dont agree with everything i believe in, this doesnt mean what they do believe in, or support is wrong (some cases it might). However if opening the door to a position for a minority that i do 100% agree with on thier issues means not voting for a somewhat less than par opponent than i'll do it.
It boils down to if i like somoene 50% and the other person only 65%, i would be inclined to vote for the 50%'r if they were a minority.