Extremists are usually very vocal in their demands and beliefs while the moderates seem to sort of just stay in the background. Most of the time primaries are dominated par the extremist factions of either party. Candidates have to tout their conservative ou liberal credentials because it's usually the really conservative ou really liberal who vote in the primaries.
So in that sense they do dominate the parties. Obama was plus liberal in the primaries than in the general election and certainly while in the office. Giuliani Lost a lot of support because he was twice divorced, pro-choice, and...
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