Obama seems to share a quality with Ronald Reagan, in that regardless of politics it is very difficult to personally dislike him.
(Yes, I know liberal partisans here despise Reagan, and would flame-on at this comment…but I reference Tip O'Neil's book on his years as Speaker under Carter and Reagan, where he was fascinated by this quality of Reagan's).

Here Obama is willing to wear a green sweater on St. Patrick's Day, and cheer with a plunger over his head.
Seriously, how many politicians would dare being caught in such a pose?
. . . especially standing beside someone who is either Green Lantern or the Grand Wizard of the Irish Clan, with his Green Mask and robes and all.

It reminds me of that great shot of Obama in front of the Superman statue, in an identical fists on hips pose to the Man of Steel.
Obama has a wry irony about him. John Edwards, in contrast, would likely be nervously patting his hair in place, and eyeing the camera angles. Obama is just out there.

Folks might dislike Obama's policies and all . . . but I suspect he would be a great person to talk with on a personal level.