From the WSJ editorial following the CT vote:
http://online.wsj.com/article/SB115515858273831388.html?mod=todays_us_opinion (subscription)
As for the commander in chief, we hope he was also paying attention to Tuesday's outcome. The American public will support a President at war, but only as long as it believes there is a strategy to win. And no President can maintain a war for long without any support from the opposition party; sooner or later his own party will begin to crack as well.
Mr. Bush can help his own cause by going on offense in Baghdad, adding more troops if necessary and doing whatever it takes to demonstrate that the fight continues to be worth the cost in lives and treasure. The Lamont Democrats may be dangerously wrong, but the American people will turn to them in frustration if Mr. Bush doesn't make the policy differences and the security stakes perfectly clear.