Nicholas Kristof puts its best, as always, in his op-ed piece for the NYTimes:
The Post Poll
By NICHOLAS D. KRISTOF
In Thursday’s column, I mention The Washington Post poll published Wednesday, and it must be pretty depressing reading. For starters, Barack Obama now seems to have a growing national lead of about 10 points, and Bill Clinton’s negatives are now higher than his positives. Secondly, while Hillary Clinton’s attacks on Obama have dented him a bit, at least against John McCain, they’ve boomeranged and hurt her even more. Nearly 60 percent in the latest poll say that she is not “honest and trustworthy.”
So I just don’t see why she stays in the race. She’s too far behind in states and pledged delegates to catch up, and if she could get ahead in popular votes she could make an argument to the superdelegates. But when you’re behind in every category, including 700,000 popular votes behind right now, you don’t even have an argument. And it seems to me that she undermines her ability to come back in four years, if Obama loses, the longer she continues the campaign. It’s certainly not in Obama’s interest for her to remain in the race — continued internecine battles reduce his chances against McCain — but I don’t see how she benefits, either.
"There is nothing heavier than compassion. Not even one's own pain weighs so heavy as the pain one feels with someone, for someone, a pain intensified by the imagination and prolonged by a hundred echoes."
-Milan Kundera