Oh boo hoo… they knew who he was when they picked him in their primary and still chose him. I feel ZERO sympathy for them. They only want a re-do now because of 2 reasons:

1. they now know even the blindest of people saw from the debate that he has zero chance of beating Trump in a fair race
2. by hand picking someone this late, they avoid any inter-party squabbles/competition that may bring out unsavory facts about each other that Trump could then use as talking points

In the end, whoever they hand pick, D-voters will fall in behind. You’ll get your guaranteed votes of minorities, unknowledgeable people voting how celebs tell them, the elite, suburban women with white guilt, etc