Most states allocate their Electoral College electors on a statewide winner-take-all basis. The exceptions are Maine and Nebraska, which give an elector to the winner of each congressional district (the other two electors go to the state wide winner). It’s not quite (or even close to) proportional representation, as evidenced by the fact that neither state has ever split their EC delegation.
That appears to change as of this election, with the Omaha World-Herald reporting that Obama has won in NE CD-2, which contains Omaha itself. That leaves Obama with 365 electoral votes; only Missouri (11 votes) remains to be decided.