The House, with all 435 voting seats in play, is probably a given, and no matter will be of greater priority to its new leadership than impeachment. But can the Democrats get the net four seats* required to get a conviction? Even if they retain all 13 of their own party's seats up for grabs, they'll have to turn four out of the 22 Republican seats in play. Once highly unlikely but now much more attainable...yet still a big challenge.

*barring any Republican senators who might cross the aisle on this one, and if opinion gets much more lopsided against Trump, some may do just that, looking towards their own runs for re-election