I disagree with Sabado's analysis, but FReepers are foolish to dismiss it entirely. FR tends to be an echo chamber. Plenty here - me, included - thought that Romney was a shoo-in back in 2012, because who could possibly support Obama?
It's also awfully early. The Dem hysteria right now is good for Conservatives, but most voters won't start really paying attention until October. About the only thing all the current hysteria and foolishness might accomplish is to turn people off so that they tune out early.
FWIW and subject to change....personally, I think that Repubs maintain a lead in the house, though it tightens. I think that they extend their lead in the Senate. The Senate, however, worries me in 2020..we'll see. Right now, Trump 2020 looks pretty good. People generally vote their wallets, and will attribute their expanded 401k's to him.
But if November is a long way away, then 2020 might as well be a lifetime.
It IS awfully early. I’m not a pollster but I am involved in predictions, and you would not believe the pressure people are under to make their final predictions early, and be right, and never change their mind. That’s the gold standard, but of course taken to extremes it’s just stupid. Weather forecasters don’t tell you whether it’s going to rain on a Wednesday six months from now. But clients will demand that you say what’s going to happen even though it’s dumb because who knows what events might transpire to change that.