Impeachment 

1) The aid to Ukraine was given and Biden's son wasn't investigated. Suggesting, in fact, the opposite of a quid pro quo.

2) Even had there been something resembling a quid pro quo. Is what Trump wanted "bad"? To investigate corruption? Let's put it another way, if he had done the same to Mitch McConnell's son would the Democrats care? The answer is no.

3) Even if what Trump did was "bad," by framing it around investigating a political rival - does it amount to an impeachable offense? IE does the punishment fit the crime? I imagine a resounding "no."

4) Does Biden's son being compromised stop anyone from voting for Biden? I don't think so.