There are any number of criticisms that candidates could have used against Obama.
Since declaring for President, this person has called Social Security a 'crisis', attacked trial lawyers, associated unapologetically with vicious homophobes, portrayed Gore and Kerry as excessively polarizing losers, boasted as his central achievement an irrelevant ethics bill, ran against the DC establishment while taking huge amounts of cash from DC, undermined Ned Lamont in 2006, criticized NAFTA while voting for a NAFTA-style trade agreement, compiled opposition research on the most effective liberal pundit in the country, refused to promise that American troops would be out of Iraq by 2013, and endorsed the central plank of the Bush-Cheney foreign policy doctrine, the war on terror.
So what does Clinton do when Obama takes the lead? She criticized, or rather, has her surrogates criticize Obama as 'too liberal' on background to reporters. It's the sleaziest dumbest attack possible, both decrepit and musty in its form and substance. The 'too liberal' attack was used against Democrats in 2006, and it didn't work. More to the point, this is a Democratic primary. What the hell?
There have been plenty of ways to puncture Obama's mystique, but they are all from the left. And for some reason, no one will make those arguments. What's ironic about the Clinton campaigns attacks on Obama is that Peter Daou, who coined the term 'Daou Triangle' to illustrate a process for moving narratives into the media by having candidates cooperate with internet communities, works for Clinton, and she has completely failed to move any negative narratives about Obama. But really, this shouldn't be a surprise, as coming at someone from the left is extremely rare, even if it might be effective.
Anyway, I feel a bit like I'm sitting in the middle of the dot com boom right now, with people telling me I don't understand the new economy which operates by different rules. Profits are no longer important, there are boundariless organizations, and it's going to be a long prosperous boom with no more business cycles. And I'm the curmodgen saying that the rules of politics, the nasty and hyperpartisan right-wing, have not been repealed.