I'm sorry to offend you I just thought a little perspective might be in order, not necessarily targeting you for anything, just observing you two were bringing up issues which are a graveyard of dead horses.
I was waiting to read about, the moon landings Bush faked, and the tainted Busch Beans that were Bush's fault next.
The collapse of a bridge while people were working and commuting on it is a tragic event, but not the first or last time it will occur in history. It certainly cannot represent a failed Presidential administration to anyone looking reasonably at that situation.
The bridge in Minneapolis is not a Hurricane Katrina, it's not a failed Iraq war, it's not 9/11. It's a bridge that slipped through the cracks of inspection wasn't closed because it was too important to regional transit, and apparently was going to be reviewed in another year or so.
It was subject to a variety of physical factors that culminated in a tragic result. Though the exact cause is yet unknown, it wasn't aliens from outer space, it wasn't tide shifts, or gravity from the planets aligning, it wasn't Communist China, and it wasn't the fault of the Bush Administration. Directly or even remotely, indirectly.