The DemocRats are going to live to regret ever settling on Joe Biden and Kamala Harris as their candidates. They would have been better off picking Warren and Buttigieg (as VP) at this point.... since the only thing Warren blatantly lied about was being Native American. Compared to all the Biden gaffes, lies and corruption, Warren looks pretty good right now.
Having Biden up front was a calculated strategy.
They figured it already worked once...see Pres. Trump Impeachment over a phone call to the Ukraine, while Joe skated after publicly bragging he had the Prosecutor fired threatening to withhold $1B in aid.
They figured as a candidate he couldn't be investigated as it would appear a political witch hunt.
And if they continue to dig, they're going to uncover a 'pyramid' of participants, including Mitt Romney, John McCain and Lindsey Graham.