"People were just getting together on their own," remembers Tom. "I guess you could call it grass roots." Like thousands of others, Tom downloaded phone lists so he could cold-call potential supporters in the area. Mary spent hours typing names and addresses into Obama's national database. The first paid operatives finally arrived in the area weeks later, only to find a virtually organized Obama machine already up and running. When the campaign held its first statewide training sessions in March, some 2,000 people turned up.It has gone on like this all year for Obama as his campaign deftly exploits the...