In Williamsburg, an eastern Iowa town of about 3,100, Sarah Giles, 89, got emotional as she explained why she picked Romney.
"When he says he's going to make America wonderful again, he's speaking my lingo. My love for this country goes deeper than anything," she said, recalling that her brother died at Iwo Jima during World War II.
Justin Green, 26, of Des Moines, voted for Obama for a second time because of his support for investment in science and education.
"There were things I was unhappy with," said Green, a law student at Drake University. "But when it all comes down to it there were a whole lot of other things I was still proud of him working on and at least attempting to reach across the aisle on at the beginning of his term."
In the congressional races, King won a sixth term, his toughest challenge yet, beating Iowa's former first lady Christie Vilsack, a Democrat.
Braley won a fourth term, beating Republican Ben Lange in Iowa's 1st Congressional District. It was the second time Braley has beat Lange, who narrowly lost his congressional bid in 2010.
Loebsack was elected to a fourth term representing southeastern Iowa's 2nd Congressional District, beating Republican Bettendorf lawyer John Archer.
Iowa voters also retained Justice David Wiggins, who in 2009, ruled with six other justices that legalized gay marriage in the state. Opponents of that decision unseated three of Wiggins' colleagues in the 2010 election, an effort that was funded significantly by conservative groups outside Iowa. They vowed a repeat this year.
But Wiggins had more than 54 percent of voters backing him with 88 percent of the votes in, the simple majority necessary for him to stay.
Sylvia Fanelli, 34, of West Des Moines, voted for Wiggins, saying, "I think he's doing the right thing and he did the right thing voting for marriage equality in this country."
In the Legislature, Republicans hoped to win a majority in the state Senate, which would let them move ahead with an ambitious agenda backed by GOP Gov. Terry Branstad. It wasn't clear late Tuesday if that had happened.
Associated Press reporters Amy Lorentzen and Ryan J. Foley contributed to this report.