It is already clear that Russia and other enemy rivals, probably including North Korea, China, Iran, and conceivably Saudi Arabia, are working on manipulating and distorting the backgrounds, records, and viewpoints of all potential Democratic Presidential candidates, as well as Congressional leaders of the party opposed to Donald Trump.
Collusion in the 2016 elections is clear, and there were hints of such activities being attempted in the 2018 Midterm Elections, although not as effective.
But the big game is who will control the White House, and these nations mentioned above love that Donald Trump is President, and that they have the ability to influence him, and undermine the democratic process in a deleterious manner.
So one must take with a grain of salt all of the negative points being published and rumored about contenders, with the understanding that no candidate is perfect in every way, and that even with shortcomings, any potential Democratic nominee for President would be a vast improvement over the disastrous, corrupt President we have now in the White House.
We are not looking for perfection, but for a President who will put the interests of the American people in the forefront, and work to reverse the damage done by Donald Trump and his ilk, and move the nation forward to new horizons.