He should, if only to refute the Clinton strategy being put out there that he is unelectable in the GE.
Hillary can point to the primary campaign and say, "See, he can't seal the deal among his own party members. McCain will rout him."
We can't win in November without Clinton supporters on board. 40% are already wary of Obama - him forcing her out would probably double that number. What we need is unity, regardless of what happens she can't win.
I agree that we need unity, but it doesn't appear that the Clinton campaign wants unity. Just for the chance of seating Fla. and MI. they've been painting the DNC and Dean as "undemocratic", effectively turning Clinton supporters against the party and the nominee.
So what is to gain by forcing someone who cannot win out, other than to look like a bully?
Healing can't begin until Hillary supporters accept that she won't be the nominee. She is giving them hope where there is none, making the eventual loss all the harder for them, and making it harder for them to move past it.
Frankly, Hillary owes it to everyone who has stood by her all these months and given her money to see this thing through.
As you stated she cannot win, so this thing has been seen through.
Trying to stop that would not just be harmful, it would be undemocratic.
There's nothing undemocratic about Obama continuing to campaign against Clinton (cause really that's the only thing he can do to force her out), and for the reasons I stated above I happen to believe it would be more harmful and divisive for the party for him to not do so.
Obama has the nomination. There's nothing good to come from needlessly antagonizing Clinton supporters further.
I've tried to keep my gloating to a minimum, but sometimes they make it very difficult.
Hopefully, the super delegates will step in and make our arguments moot.