Congressman Dan Lipinski is backing U.S. Senator Barack Obama's presidential bid.
Lipinski had been one of the two remaining holdouts among Democratic superdelegates in Illinois' congressional delegation. He says he's endorsed Obama because of the candidate's emphasis on overcoming partisanship and uniting the country.
Lipinski's district in southwest Chicago and its southwest suburbs narrowly voted in favor of Obama over New York Senator Hillary Rodham Clinton in Illinois' presidential primary last month.
Representative Rahm Emanuel of Chicago is a former White House aide to President Clinton and now the chairman of the House Democratic Conference, and he remains neutral in the presidential race.
The rest of the Democrats in the delegation support Obama.
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