As a practical matter, last night's primary results changed very little: Barack Obama has a pledged delegate lead that is almost insurmountable (thanks to TPM for the link).
But politics can be as much about atmospherics as practical realities, and the new story line spinning out of the results seems to involve concepts like "reset" and "start over." This cannot change the hard math, but it will affect the coverage the three major presidential aspirants get over the next few weeks.
As Jack Farrell argues over on Robert Emmet, the atmosphere is about to get turbulent for the Illinois senator:
The late Sen. Eugene McCarthy once said that the press was like a flock of birds. When one bird lands to rest its wings, the other birdies join it. When one bird flies from the telephone wire, all the others follow.
So, buckle up Obama fans. Hillary Clinton's victories in Texas and Ohio and Rhode Island yesterday will send the flock in a new direction.
...
[The press] still love the idea of President Barack Obama. And they don't much like the Clintons. But Barack has let them down. Made them look tame, and soft and stupid.
So now they are grumpy. And so he will pay.
The press turning on Obama was an inevitability, it's the nature of the animal. The twin questions facing the Obama campaign were whether he could wrap up the nomination before the pack turned and once they did whether he and his operatives can handle a querulous press corps as well as they did a quiescent one. The answer to the first question was "not quite." The answer to the second is still developing.