If the Port Authority people had decided to shut down the traffic, but there was no evidence that Chrisie's office was involved, this wouldn't be a major story. The guy would be fired and that's that. The difference is that Chrisie's Deputy Chief of Staff directly ordered it (in a suspiciously causal and pre-planned way) and laughed about it afterwards. Where is the similar email chain from Obama's Deputy Chief of Staff ordering the IRS audits against Tea Partiers again, now that we've had months of investigations and hearings (that actually just showed the IRS audited OWS too, though the chair of the Republican investigations hid that fact to allow the outrage to continue)?
There's always a vague truth that "the buck stops here" and both Obama and Chrisie deserve some flak for what happens under their watch, but there's a huge difference between someone down the line doing something bad and your deputy ordering someone down the line to do something bad.