The biggest con in modern history isn't that Trump won. It is that the democrats who lost to Trump have convinced their base that they are not to blame for the loss and if they double and triple down on the same strategy that lost, magically it will work.
If the left wants to defeat Trump should he run again, they need to come up with a new strategy that does not involve blaming Russia and grand conspiracies for the Clinton campaign getting it wrong and all the professional pundits getting it wrong. Even if Russia tried to interfere with the election, it does not change that the DNC's hundreds of millions in ad spending wasn't negated by some hashtags and memes. It is little more than "Look! A squirrel!!" CYA.
Here is something to ponder--even if Russia were effective in electing Trump as alleged (not that they were), that would not explain why the DNC has been run out of so many seats that its landslide blue wave has them with their fewest number of seats since the Great Depression.
Stop relitigating 2016, if you want to win 2020, democrats. You lost. Get over it.