WASHINGTON Hillary Clinton, the prohibitive favourite in the Democratic presidential race just months ago, faces the possible end of her White House road on Tuesday in Ohio and Texas.
The New York senator battled on Monday to save her campaign with victories in the two showdowns, which would halt Mr. . Obama's streak of 11 consecutive wins in their hard-fought duel to be the Democratic nominee in November's presidential election.
Voting ends in Ohio at 7:30 p.m. EST (0030 GMT on Wednesday) and all voting in Texas will be over by 9 p.m. EST (0200 GMT on Wednesday).
Ms. Clinton's husband, former President Bill Clinton, has said she needs to win both states to continue her campaign, a view shared by many analysts. Polls show tight races in both.
Even a split decision in the two states would leave her with a steep climb to overtake Mr. Obama's lead of roughly 150 pledged convention delegates who select the nominee, and increase the pressure on her to quit.
"There will be people in her campaign who will argue a split decision is good enough to continue," said Cal Jillson, a political scientist at Southern Methodist University in Dallas. "But as a practical matter, just looking at the delegates, the numbers won't really add up for her."
Mr. Obama endorsed the idea Ms. Clinton needs wins in both states, which have a combined 334 delegates at stake, to prolong the Democratic race.
"If we do well in Texas and Ohio, I think the math is such where it's going to be hard for her to win the nomination. And they'll have to make a decision about how much longer they want to pursue it," the Illinois senator said in an ABC interview shown on "Good Morning America."
Republican front-runner John McCain, an Arizona senator, also can come close to clinching the nomination on Tuesday with expected wins over his last remaining major challenger, former Arkansas Gov. Mike Huckabee.
Ms. Clinton's advisers have worked overtime to roll back expectations and turn up pressure on Mr. Obama in Tuesday's contests in the two big states and Vermont and Rhode Island. But they would not speculate on what Ms. Clinton would do in the case of a split decision.
"We are very optimistic about our chance of success in Ohio and Texas. If the outcome is different we can talk about it then," said Clinton spokesman Howard Wolfson.
Like her husband, who nicknamed himself "The Comeback Kid" for his improbable rise to the White House in 1992, Hillary Clinton has dodged predictions of doom before. In January, Mr. Obama appeared ready to deal her a knockout blow in New Hampshire after his big win in Iowa, but she defied polls and swept to victory.
A few weeks later, her landslide loss in South Carolina and a string of high-profile endorsements gave Mr. Obama momentum heading into Super Tuesday contests around the country, but she battled him to a draw and won most of the biggest prizes of the night in California, New York and New Jersey.
"This has been a roller coaster race, and every time people try to foreclose it the voters come back and say 'just wait a minute here, we want to have our say,'" Clinton strategist Mark Penn told reporters.
"Let's see what the voters say, let's take a look at what the situation looks like on Wednesday, and I think it will be pretty clear," he said.
Ms. Clinton hunted for votes in Ohio and Texas on Monday. She began her day with a pre-dawn visit to a Chrysler assembly plant in Toledo, Ohio, a city that has struggled with the losses of manufacturing jobs and poverty.
Ms. Clinton planned to buy cable time in the evening for a televised town hall meeting in Texas, while Mr. Obama planned a two-minute ad on evening newscasts in Ohio that it billed as his closing argument to voters.
"The question you have to ask yourself is this: Who can take can take us in a fundamentally new direction? I'm running to finally solve problems we talk about year after year after year," Mr. Obama said in the ad.
Under Democratic rules allowing the losers in each state to win a proportional amount of delegates, Clinton will be unable to dramatically close the gap on Mr. Obama unless she scores big wins in Ohio and Texas that appear to be beyond her grasp.
Obama campaign manager David Plouffe released a memo questioning Ms. Clinton's options if she does not make major strides in catching up to Mr. Obama in pledged delegates.
"While the Clintons gamely continue to try to move the goal posts, at some point there has to be a reckoning," he said. "What is their path to secure the nomination? No amount of spin can change the math."







