I can't answer the question in the post title -- apparently no one has told me all the rules, but I would have called this a "bribe" rather than a "gracious gesture," as Kevin Drum does:
The latest rumor making the rounds is that maybe
Barack Obama will pay off Hillary's $11 million loan to her campaign if
she quits the race. I suppose that makes some kind of sense "” and it
would be a gracious and unifying gesture from Obama
If Newt Gingrich had paid a fellow politician $11 million to drop out of the Spearker's race against him, that would have been a, what? Gracious gesture? I doubt it.