We are going to have to wait and see about what was said on the Ukraine call. And if there is one lesson the Democrats should have learned from the Mueller Report is to keep their powder dry until they know exactly what to hammer on.
But as far as Biden goes, this leads him into two important areas.
Direct Conflict With Trump - If he looks good in his public back and forth... his electability argument is bolstered. But if doesn't... he is in serious trouble.
Talking About His Family - He hates doing it. His son Hunter is a walking disaster. Anytime he is brought up we are a sentence away from talking about drug abuse, broken families and that time Hunter hooked up with his dead brother's widow.
And that is IF there is nothing to the Ukraine allegations.