Sen. Barack Obama swept the Louisiana primary and caucuses in Nebraska and Washington state Saturday night, slicing into Sen. Hillary Rodham Clinton's slender delegate lead in their historic race for the Democratic presidential nomination.
The Illinois senator also won caucuses in the Virgin Islands, completing his best night of the campaign.
His winning margins were substantial, ranging from roughly two-thirds of the vote in Washington state and Nebraska to nearly 90 percent in the Virgin Islands. With returns counted from more than one-third of the Louisiana precincts, he was gaining 53 percent of the vote, to 39 percent for the former first lady.
As in his earlier Southern triumphs in Alabama, Georgia and South Carolina, Obama, a black man, rode a wave of African-American support to victory in Louisiana.