I remember we did the same thing during their first election. I don't see it as any big deal. 1500 hardly registers percentage-wise. And they probably aren't permanent.

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“I’ve been fighting alongside ACORN on issues you care about my entire career. Even before I was an elected official, when I ran Project Vote voter registration drive in Illinois, ACORN was smack dab in the middle of it, and we appreciate your work.” — Barack Obama, Speech to ACORN, November 2007