PRINCETON, NJ -- The Democratic convention appears to have helped solidify support for Barack Obama among former Hillary Clinton supporters, with the percentage saying they will vote for Obama in November moving from 70% pre-convention to 81% after the convention, and the percentage certain to vote for Obama jumping from 47% to 65%.
http://www.gallup.com/poll/109957/obama-gains-among-former-clinton-supporters.aspx
And in the end Clinton supporters showed up in numbers. You make a great point about how putting too much weight behind these polls can lead one astray. Snapshots in time.