John McCain, meanwhile, has won in South Carolina, Tennessee and Oklahoma.
In all, that gives Obama 78 electoral votes so far. McCain has 34.
Biden is also the winner in his Delaware Senate race. The state's Democratic governor would appoint a successor if Biden becomes vice president.
Democrats John Kerry of Massachusetts, Frank Lautenberg of New Jersey and Richard Durbin of Illinois have held onto their Senate seats, as have Republicans Lamar Alexander of Tennessee and Susan Collins of Maine.
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