WASHINGTON — 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.    “Today, voters from the West Coast to the Gulf Coast to the heart of America stood up to say ‘yes we can”’ Obama told a cheering audience of Democrats at a party dinner in Richmond, Va.    He jabbed simultaneously at Clinton and Arizona Sen. John McCain, saying the election was a choice between debating the Republican nominee-in-waiting “about who has the most experience in Washington, or debating him about who’s most likely to change Washington. Because that’s a debate we can win.”    Clinton preceded Obama to the podium. She did not refer to the night’s voting, instead turning against McCain. “We have tried it President Bush’s way,” she said, “and now the Republicans have chosen more of the same.”    She left quickly after her speech, departing before Obama’s arrival. But his supporters made their presence known, sending up chants of “Obama” from the audience as she made her way offstage.
   Obama’s winning margins ranged from substantial to crushing.
   He won roughly two-thirds of the vote in Washington state and Nebraska, and almost 90 percent in the Virgin Islands.
   Nearly complete Louisiana returns showed Obama with 57 percent of the vote, to 36 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. Clinton won the white vote overwhelmingly.
   In all, the Democrats scrapped for 161 delegates in the night’s contests.
   In incomplete allocations, Obama won 72, Clinton 40.
   In overall totals in The Associated Press count, Clinton had 1,095 delegates to 1,070 for Obama, counting so-called superdelegates. They are party leaders not chosen at primaries or caucuses, free to change their minds. A total of 2,025 delegates is required to win the nomination at the national convention in Denver.
   McCain flunked his first ballot tests since becoming the Republican nominee-in-waiting. He lost Kansas caucuses to Mike Huckabee, gaining less than 24 percent of the vote. Huckabee, the former Arkansas governor, got nearly 60 percent of the vote a few hours after saying, “I majored in miracles, and I still believe in them.” He won all 36 delegates at stake.
   Huckabee also won the Louisiana primary, but fell short of 50 percent, the threshold necessary to pocket the 20 delegates that were available. Instead, they will be awarded at a state convention next weekend.
   McCain won the third Republican race of the night, Washington’s caucuses. None of the state’s delegates will be awarded until next week.
   For all his brave talk, Huckabee was hopelessly behind in the delegate race. McCain had 719, compared with 234 for Huckabee and 14 for Paul. It takes 1,191 to win the nomination at the national convention. 

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