Frankly, I hope the Dems continue to put all their energies into the Russian investigation and ignore Alan Dershowitz and his legal opinion that even if the Trump campaign and Russia worked together to defeat Hillary Clinton, it would not be illegal.  The Obama administration worked with the anti-Brexit group in Great Britain as well as the opponent to Benjamin Netenyahu in the recent Israeli Prime Minister election and I don't recall anyone complaining about collusion in either of those elections.  Just because Russia preferred Trump to Clinton does not mean we should have voted for Clinton.  In fact, as I recall, it was Clinton who wanted a good relationship with Russia (recall the red reset button) and Obama who decided to not place air defense systems in Eastern Europe.  Obama also refused to provide military aid to Ukraine and thanks to a hot mic was overheard telling Medyedev that "he could be more flexible after his election".  I don't recall hearing any Dem complaints then.