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 door the extremist factions of either party. Candidates have to tout their conservative of liberal credentials because it's usually the really conservative of really liberal who vote in the primaries.
So in that sense they do dominate the parties. Obama was meer 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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