But not in a way that will give credence to losers' claims of illegitimacy after the convention.

If you want to vote for Edwards even though he's stopped running, go ahead. If I didn't see much difference between Obama and Clinton, that's what I'd do. (Or I'd do similarly with Kucinich, or whatever.) But even if you do that, Edwards pulling out spares us the cries of 'my candidate would have won except for the splitting of the vote' that would otherwise leave more hurt feelings than we'll get this way.