When Barack Obama announced his presidential candidacy in Springfield, Illinois, on February 10, 2007, he promised to change the practice of American politics.

This campaign must be the occasion, the vehicle, of your hopes, and your dreams. It will take your time, your energy, and your advice--to push us forward when we're doing right, and to let us know when we're not.

Obama told the crowd on that chilly day that he was running "not just to hold an office, but to gather with you to transform a nation." He was particularly concerned with the way politicians run for office. He decried "the smallness of our politics" and "the chronic avoidance of tough decisions" and politicians who win by "scoring cheap political points." All of this, he said, had led voters to look away in "disillusionment and frustration."

"The time for that politics is over," Obama said.

Or maybe not.

This past week at a campaign rally, Obama told his supporters to challenge Republicans and independents skeptical of his candidacy. "I want you to argue with them and get in their face," he said.

This is the newer, tougher Obama. The avatar of a new American politics of hope is gone, replaced by a no-nonsense practitioner of the old politics. His campaign is now less the vehicle of your hopes and your dreams than a vehicle of your frustration and your anger.

You might think that this walking, talking contradiction would be the focus of intense media scrutiny--hypocrisy being a staple of modern political

The media line on the new Obama is simple: It's John McCain's fault. Barack Obama would like to win the presidency the right way but McCain won't let him.

According to the press, in recent weeks, the McCain campaign has so distorted Obama's record and campaign proposals that the young senator has had no choice but to fight back with old-school tactics. "McCain's tactics are drawing the scorn of many in the media and organizations tasked with fact-checking the truthfulness of campaigns," wrote Politico's Jonathan Martin. "In recent weeks, Team McCain has been described as dishonorable, disingenuous and downright cynical."

And so while McCain's every utterance is factchecked and factchecked again in an attempt to shame him from challenging Obama too aggressively, Obama gets a pass.

Consider two examples.

On August 16, Pastor Rick Warren asked John McCain how much money someone would have to make to be considered rich. McCain didn't answer directly. "I think that rich should be defined by a home, a good job, an education and the ability to hand to our children a more prosperous and safer world than the one that we inherited," he said.

Then he made a joke: "So, I think if you are just talking about income, how about $5 million?"

The audience laughed, immediately understanding that McCain was being facetious. Just in case there were any doubts McCain started his next comment by saying "seriously," to underscore the joke. Then he made a prediction.

"I'm sure that comment will be distorted," he said with a shrug of his shoulders.