Mind you, there are always people who vote for "This person is like me." They vote for the politician from their home state, or is Irish like them, or Baptist like them or whatever. However, even in those cases they have to like the person first. The "like me" is always secondary. It's why black politicians don't always win even in black dominated districts, for instance.
To think that Obama was elected solely because he was black is absurd. If anything, it hurt him in certain parts of the country. I'd venture to say that if he had been considered white, he would have done even better.
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Also, it helps to have someone who talks about taking from the rich and giving to the poor.
And, I don't recall mentioning just liberals, so I don't know why you are so focused on them.
Im focusing on people who just voted for Obama to "make history".