I can see Russ Feingold challenging Clinton in 2020 if they each win this November.
I hope that was the deal bernie made with him to give him access to mailing list. Doubt it tho. Is hilarious Bernie has that mailing list as a weapon. Just comes into the hands of a 74yr old man.
2018 will be the big year for him to see if he has a chance. 2017 we should be able to tell if he will be a force in 2018 elections - but who knows. I would suggest less money in symbolic races like Canova and hopefully more spread around the country. If you roll a 10-sided dice 50 times you might get somewhere.