To clarify for those who are interested, at no point did Trump ask for a "favor" which involved digging up dirt on his political opponents. It's actually not entirely clear what he wanted, but it related to CrowdStrike, a cybersecurity firm which investigated the "hacking" of the DNC in 2016.
This is what the president actually said:
"I would like you to do us a favor though because our country has been through a lot and Ukraine knows a lot about it. I would like you to find out what happened with this whole situation with Ukraine, they say Crowdstrike ... I guess you have one of your wealthy people... The server, they say Ukraine has it".
This is what he said about Biden:
"The other thing, there's a lot of talk about Biden's son, that Biden stopped the prosecution and a lot of people want to find out about that so whatever you can do with the Attorney General would be great.Biden went around bragging that he stopped the prosecution so if you can look into it ... It sounds horrible to me."
No sane person thinks that these messages indicate anything which justifies impeachment; we're just back to the same game of people who've hated the idea of Trump presidency since 2015 inventing reasons why he should be removed from office. As I mentioned in my first post, the press are - of course - using misleading headlines and manipulatively cropped segments of the conversation in order to fuel a false narrative.