Ds are caught between a rock and a hard place. Impeach and risk turning The Don into a martyr and pissing off much of America. Not impeaching risks alienating your base and losing their votes and money.
With any luck, their failure to impeach will lead to the demise of the two party system. That would be awesome.

the parties, especially the R party, have already been destroyed!
IT'S A CATCH 22 ALRIGHT!
But in my own life, no matter how hard it is going to be, doing the ''right thing'' is what one should strive to do....
short term, it may cost them seats... but leaving the presidency opened to lawlessness being ok, for any future president, is not good for the nation...
they are being cowards imho.... Yes they fear the unknown of how it would all turn out, 4 more years of Trump will end the USA as we know it and scares the PaJesus out of them...
BUT if they do not charge him with articles of impeachment for his lawlessness, gawd help us, with presidents even worse, down the road.... imo.