Sen. Hillary Clinton, D-N.Y. has battled back from the political brink by defeating Sen. Barack Obama, D-Ill., in the crucial voting states of Texas and Ohio, where the former first lady fought hard for Latino voters and the white, working class voters who have typically supported her in earlier primaries.
The headline battles in delegate-rich Ohio and Texas were considered crucial primary contests that could cement Obama's hold on the Democratic presidential nomination, or help Clinton continue to fight on for her party's nomination.
In her victory speech in Columbus, Ohio, Tuesday night, Clinton claimed a comeback.
"For everyone here in Ohio and across America, who's ever been counted out but refused to be knocked out and for everyone who has stumbled but stood right back up, and for everyone who works hard and never gives up, this one is for you," Clinton told a cheering crowd of supporters.
"This nation's coming back and so is this campaign!" Clinton said.
A Clinton adviser said the Ohio win would be enough for Clinton to fight on to the next big primary in Pennsylvania on April 22, nearly six weeks from now — the longest stretch of time without a contest in the nomination season.
"I dont see anyway she doesn't go forward now," a Clinton adviser told ABC News' Eileen Murphy. "We were outspent massively. Ohio clearly augurs well for Pennsylvania. We'll see what happens in Texas but in my view there's no argument for getting out," the adviser said.
In a subdued speech to supporters Tuesday night in San Antonio, Texas, Obama maintained he is still ahead in the delegate count and slammed his Democratic rival.
"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 said.
"This is not the future we want. We want a new course for this country. We want new leadership in Washington. We want change in America," Obama told supporters. "John McCain and Senator Clinton echo each other in dismissing this call for change."
On the Republican side, Senator John McCain, R-Ariz., swept the March 4 GOP primaries in Ohio, Texas, Rhode Island, and Vermont and now has the 1,191 delegates needed to become the Republican presidential nominee, according to ABC News' delegate count.
"I am very very grateful pleased to note my friends. that tonight 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 told supporters Tuesday night.
"The contest begins tonight," he said to cheers and applause.
At McCain's election night party headquarters in Dallas, a huge banner reading "1191" hangs alongside hundreds of red, white, and blue balloons.
McCain will meet Wednesday with President George W. Bush, who is expected to endorse the Arizona senator at an event in the Rose Garden at the White House.
Conceding the race, former Gov. Mike Huckabee, R-Ark., suggested his candidacy gave a voice to the millions of Christian evangelical voters who supported his campaign.