You mean impeachment could embarrass the Democratic candidate most likely to stroke out, lose his dentures, say something racist, or grope a woman in the general. In addition to that it could tie up the left wing candidates for weeks?Biden will be called to discuss how the company his son is on the board of came to be recommended by the US government to the government of Ukraine. I also think there will be real questions in regards to the formation of the Ukraine "Anti-corruption" council (or whatever its called), and the US's role and funding of it.
It will be weeks of testimony, which will tie up Senators Sanders and Warren right in the peak of campaign season.
What Dem would be in favor of that?