Actually, we hope dems nominate it for the very reason you stated.Warren would be a flaming disaster in a presidential run. Let hope the dems voters have better sense than thatBiden is history. Warren will be the Dem candidate and Trump will be elected President in 2020.Joe Biden calls for Trump to be impeached - CNNPolitics
Finally, Biden has said what needs to be said, that Trump is an incompetent president who has violated his oath of office and our Constitution and who must be impeached.
The evidence against Trump is overwhelming even though it is ignored by the far right Trump supporters. It is past time for the House and Senate to do their jobs; impeach the sorry SOB. The health of our nation and it's reputation in the world demands it.