McCain and Obama were pretty much tied in the EC heading into the conventions. All signs are that McCain improved his standing more than Obambi did.
It will just take a few weeks for the state polls to catch up to that reality.
I just took a look at the RealClearPolitics electoral map and they show Obama up 273 to 265. This poll shows Obama taking Colorado and its 9 electoral votes by a 0.4% margin. Note that this Colorado poll is based on polling done between 8/11 and 8/26.
If Colorado has moved just 0.5% in McCain’s direction in the last week then McCain would be ahead 274 to 264.