I've long thought Obama would be a stronger candidate in the general election because of his starker contrast with Republicans (particularly on the war in Iraq) and Hillary's high negative numbers in the polls. But recent polls show just how much stronger he would be against McCain. In several key states—Wisconsin, Iowa, Colorado, and Virginia—it could swing the election. In all four, he's currently beating McCain in head-to-head polls. Hillary loses substantially.

Take a look:

Virginia:

McCain - 45%
Obama - 51%

McCain - 48%
Clinton - 45%

Iowa:

McCain - 41%
Obama - 51%

McCain - 52%
Clinton - 41%

Wisconsin:

Barack Obama - 52%
John McCain - 42%

Hillary Clinton - 42%
John McCain - 49%

Colorado:

Barack Obama - 46%
John McCain - 39%

Hillary Clinton - 35%
John McCain - 49%

The comparison may be moot, as I think tonight's victory in Wisconsin unofficially secured the nomination for Obama. But anything can happen, and I think it will take a victory in Texas to end the primary race.