I've been skimming the posts and comments about water use in the Colorado watershed, and every once in a while I see posts about supplying water from the Great Lakes out west.
Two things:
1) The Great Lakes Compact would make such a thing darn near impossible without the agreement of the state and provincial governments of every state (edit: and province) bordering the Lakes.
2)The reason the Compact came to be was the disaster in the Aral Sea, where the Soviets (and their offshoots) diverted water from a seemingly inexhaustible fresh water supply.