No it is not. Mitt Romney may very well be a pro-choice candidate, but the GOP is bigger than one man. Vote your conscience when it comes to Mitt, but there's a lot of other candidates running for different offices that call themselves Republican.
It's time that people think bigger than just one presidential candidate who controls 1/3 of the government.
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If they are conservative I won't hold the R against them, but the top slot does set the tone.