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The Indiana senator

The Indiana senator, who introduced Obama, has been at the heart of the VP buzz. Political pundits had speculated that Obama might tap him to be No. 2 as early as this week because of their joint appearance.

Bayh, a former two-term governor of Indiana, was a big supporter of Hillary Clinton during the primaries. Advocates of an Obama-Bayh ticket say he'd help unify the party and could shore up some of Obama's weak spots because of his time on the Senate Intelligence and Armed Services Committees.