Basically what Andrew said:
I can see no problem with the ad run by Obama on his extraordinarily ballsy decision to choose the riskiest path to get bin Laden and all the intelligence his compound contained. It is the kind of ad that would be a no-brainer for any Republican president, seeking re-election. If Bush had done it, he would have jumped out of a helicopter in a jump-suit with fireworks.
The notion that running on your accomplishments, and arguing your opponents wouldn't do the same, is somehow "dividing America" is one reason why you'll likely see less political blogging from me this year.
See Fallows also for a robust defense of Jimmy Carter.