Hillary Clinton today sounds like someone who’s either seen encouraging internal polling or early exit poll results. She said in Houston this morning, “You know, this is a long process,” and that her campaign is just hitting its stride.

Just a few weeks ago her husband said she’d need to win both Texas and Ohio to continue.

Obama’s campaign quickly responded with a statement from a spokesman. “Three weeks ago, when they led polls in Texas and Ohio by 20 points, the Clinton campaign set their own test for today’s primaries.”

But Obama might have the same information Hillary does; the spokesman set low expectations for the Illinois senator and said only that he will maintain his delegate lead.

If you plug in the numbers at Slate.com’s delegate calculator, you can see how it’s nearly impossible for Clinton to prevail.

Some of the superdelegates are already breaking for Obama. If they coalesce around him, perhaps as early as tomorrow, they could be the ones to decide the nomination.