You're trying to spin it as expected. Not the full transcript. You didn't tell me how Ukraine started the convo, because they didn't,Trump did. He didn't care about this stuff until after Biden became a candidate. What has been released is clear as day. Also, didn't touch the aid getting released when this story first broke. It's amazing to watch Trumpers try to spin this as anything good for him.
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As far as Dems, basically a 2 person race, Biden and Warren. Sanders and Warren basically the same. Sanders should drop out and Warren would get a lot of those votes and then actually have a chance.
Biden up 7.7 over Trump, last Fox News poll had him up 14 points -
https://www.realclearpolitics.com/epolls/2020/president/us/general_election_trump_vs_biden-6247.html
He'll probably pick Klobuchar as his running mate, solid moderate.
What about those Never-Trumpers? Easier to vote for a moderate like Biden, than somebody that leans left like Sanders/Warren. I think they come into play in this election. Trump has made too many enemies.