CORE VOTING BLOCS David Archuleta: Rabid speed-dialing 10- to 14-year-old girls, and their grandmothers. David Cook: Teenage rocker fans and grown-up music geeks. The Edge: Archuleta. Young girls are the most important demo in the Idol universe, by far. Their ability to speed dial their votes in without tiring for the entire voting period makes every 12-year-old girl supporter equal in power to 100 adults.
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