It's game over for Senator Clinton. We have a clear front-runner. Chadwick Matlin at Slate.com:

After tens of thousands of handshakes, thousands of stump speeches, and hundreds of meet-and-greets, Democrats are tired. They want one candidate—and that candidate is going to be Barack Obama.
We don’t have to look any further than Texas and Ohio to see the exhaustion firsthand. Rasmussen polls had him down by 16 points in Texas eight days ago (post-Potomac, pre-Wisconsin). Now he trails by only three points. The newest Washington Post/ABC News poll shows that Texans like Clinton more than Obama on the issues that matter most—health care and the economy. Yet he’s in a statistical tie with her overall. Why? Because 47 percent of the state’s Democrats believe he has the best chance of getting elected president in November—thirty-six percent say that’s the case for Clinton. In Ohio, there’s an even larger disparity between whom Ohioans favor—Clinton—and whom they think can win in November-Obama.