Daniel Foster makes it:
[T]he College reflects the formal and constitutional fact that the president is elected chief executive of a union of states — federated but sovereign — and not a glomeration of people. The executive of the Constitution, of the Founders, is president of the United States, not president of America. Its detractors consider it an anachronism, but if federalism still means anything — and sadly, that’s something of an open question — then the College is as vital as ever. It affirms that we vote as citizens of the several states, not mere residents of arbitrarily drawn administrative districts.
Bernstein supports the electoral college for different reasons:
I still believe that the interests which benefit from the electoral college are, on balance, those that are hurt by other factors in the overall system. Currently, the states helped appear to be medium-size competitive states (Ohio most of all, but Wisconsin, Colorado, Virginia and Pennsylvania are all in Nate Silver's top ten tipping point states right now). It's not as good as when California and New York were swing states, but it's still a different set than are helped by the Senate.