Barack Obama suffered a setback Tuesday in his efforts to drive rival Hillary Rodham Clinton out of the race for the Democratic presidential nomination, but claimed the delegate math still is on his side.
"We know this: No matter what happens tonight we have nearly the same delegate lead as we did this morning and we are on our way to winning this nomination," Obama told supporters after Clinton broke the Illinois senator's winning streak.
Hillary Rodham Clinton finally had a confetti night. The Democratic presidential hopeful claimed victory in the Ohio primary Tuesday night and said that means, "We're going strong and we're going all the way."
Confetti rained down on her Ohio rally as she took the stage. She told the crowd her performance was a victory for everyone who's been "counted out but refused to be knocked out."
Highlights of preliminary results from exit polls conducted for The Associated Press and television networks in Tuesday's presidential primaries in Ohio, Texas, Rhode Island and Vermont:
John McCain clinched the Republican presidential nomination on Tuesday and Democrat Hillary Clinton won a crucial showdown with rival Barack Obama in Ohio to breathe new life into her campaign and prolong the Democratic race.
McCain's four big victories in Vermont, Ohio, Texas and Rhode Island drove his last major rival, former Arkansas Gov. Mike Huckabee, out of the race and gave McCain more than the 1,191 delegates needed to win the nomination.
President George W. Bush will greet the Arizona senator at the White House on Wednesday and back his campaign.
"I am very pleased to note that tonight, my friends, we have won enough delegates to claim with confidence, humility and a sense of great responsibility that I will be the Republican nominee for president of the United States," McCain, 71, told supporters in Dallas.
Ohio and Texas loomed large Tuesday for Democrats Barack Obama and Hillary Rodham Clinton, with excrutiatingly close primaries in both states determining the final chapter of a mesmerizing presidential contest.
After 11 straight losses to Obama, Clinton mustered a win in tiny Rhode Island while Vermont delivered an overwhelming victory to Obama. But it was contests in the southwest and in the heartland that would set the direction for the campaign to come.
Mike Huckabee bowed to reality Tuesday and out of the Republican presidential race. "We kept the faith," he told his end-of-the-road rally Tuesday after John McCain clinched the nomination. "I'd rather lose an election than lose the principles that got me into politics in the first place."
The genial conservative went out as he had campaigned all along, with a quip: "It's time for us to hit the reset button."
John McCain's last-man-standing strategy prevailed. Now, on to the general election and the hurdles that come with it.
"I do not underestimate the significance nor the size of the challenge," the Republican nominee-in-waiting told the Associated Press on Tuesday, looking to the next chapter of his presidential quest.
A significant challenge is right.
Hillary Rodham Clinton showed renewed strength Tuesday in Texas and Ohio among whites and working-class voters who had begun deserting her in recent contests, early results from exit polls in the states showed.
With her back against the wall in a pair of contests that seemed virtually must-win, the New York senator seemed to be limiting Barack Obama to groups that have supported his candidacy from the start of this year's Democratic presidential contest.
John McCain secured the Republican presidential nomination as the ultimate survivor -- winning it eight years after his first failed attempt and decades after cheating death in the Vietnam War.
Easy to laugh and easy to anger, McCain carries with him the scars of battle in both armed conflict as a naval pilot and in the political wars of Washington as a U.S. senator from Arizona.
NBC News has declared Hillary Rodham Clinton as the winner of the Democratic primary in Ohio.
With just over 50 percent of the votes counted, Clinton has 57 percent of the vote compared with 41 percent for Barack Obama.