Barack Obama has now added Iowa's seven electoral votes to his total, as he builds on his commanding lead over John McCain.
Obama now has 202 electoral votes out of the 270 he needs for the nomination.
He earlier won in Pennsylvania and in Ohio _ both states that were key to John McCain's hopes. No Republican has ever been elected president without capturing Ohio.
McCain adds five electoral votes each with his victories in Utah and West Virginia. That gives him 80 in all.
Democrats are adding to their Senate majority. Among the Democrats re-elected to Senate seats are Tom Harkin in Iowa and Max Baucus in Montana.
Republican Thad Cochran won re-election in Mississippi.