The majority of superdelegates are sitting on the fence, but among those who have decided whom to back, Clinton leads Obama, according to ABC News' latest tallies. Obama has warned superdelegates to vote the way their home state voted.
With Obama's momentum on a roll, former George W. Bush campaign strategist Matthew Dowd says it will be very difficult now for Clinton to win the nomination.
"It's a very tough spot she's in," Dowd said. "She's in this time frame where she can't throw up a road block, there's no primary or caucus that can stop Obama's momentum in any real way until March 4 and that's a long period of time to go without winning."
Dowd said her first opportunity to change the narrative of Obama's win will be the debate in Austin, Texas, next week.
Campaigning in Texas today, Clinton said she isn't giving up.
"I want to congratulate Sen. Obama on his recent victories and tell him to meet me in Texas, we're ready," Clinton said. "This is the exciting part of the campaign. Where you really get down to saying, 'OK what are the differences, how do we draw the distinctions?'"
She told a crowd today she can hear the voices of two strong Texas women who have died — former Texas Governor Ann Richards and former Texas Rep. Barbara Jordan — urging her to go on.
"I can hear their voices saying, 'You keep going! You give the people a real choice about the future!'" Clinton said.
Perhaps a sign of a new, tougher, campaign strategy under new campaign manager Maggie Williams, Clinton also sharpened her attack on Obama.
"We need real results, not more rhetoric … There is a very important choice and a big difference in the candidates in this race. I am in the solutions business. My opponent is in the promises business. I think we need answers, not questions," Clinton said.
In another sign of sharp elbows, the Clinton campaign launched a negative campaign ad today in Wisconsin, where Obama delivered a policy address on the economy.
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