Read about it here:
“Since 2004, ACORN has helped more than 1.7 million low- and moderate-income and minority citizens apply to register to vote...”
“ACORN is a non-profit, non-partisan social justice organization...”
My guess is that Obama’s share of this voting block is just under 100%.
McCain gets the remainder.
My guess is on voting day he gets more like 150-200% of their votes.