Obama's mastery of his rote talking points is impressive, but they failed him on key exchanges tonight. If the McCain campaign produces a Joe the Plumber ad, and marries it to the Obama/Hoover jab it can turn this debate on the economy while keeping a focus on Obama's judgment when it comes to ACORN, Ayers and the rest of Senator Obama's associates. A very good night for John McCain overall. Obama had a chance to end the campaign tonight, but just the opposite happened. Obama was in the prevent defense mode, and McCain moved the ball a long way down the field.