Whose Responsibility?

So there's been a lot of talk in Democratic circles lately about Sen. Obama getting his supporters and donors to help Sen. Clinton "retire" her debts that were run up in her primary campaign. The Washington Post is reporting: 

He [Obama] also sought to lead the move to unite by example, announcing that he had personally written a check for $2,300, the maximum he can give, to help retire Clinton's more than $20 million in campaign debt and that he had urged his biggest supporters to follow suit. The announcement drew a standing ovation. More than 200 Clinton fundraisers were on hand for the emotional event. Clinton supporter Terence R. McAuliffe, who emceed the event, said that the people in the sparse conference room had helped to bring in $230 million for her campaign.

What I don't understand is why is this Sen. Obama's responsibility? I thought Democrats were supposed to be the fiscally responsible ones, yet here's Sen. Clinton and her supporters demanding that Sen. Obama get his supporters and donors to pay off her debt. Didn't she run up that debt herself by staying in the race after it became evident that she couldn't win the nomination? Where's the responsibility? 

Right now I'm not seeing Sen. Clinton take much responsibility for her own actions.