US Midterms 2018
So how do we think the midterms are going to go down? Right now, Democrats are leading about 5-10 points on the generic ballot, which should be around about enough to retake the House. However, gerrymandering probably means they'll need to have a popular vote margin closer to 10 to be safe.
https://projects.fivethirtyeight.com/congress-generic-ballot-polls/?ex_cid=rrpromo
The Senate is rightly seen as a difficult map. But there is some hope for the Dems. Red state Democrats like Heidi Heitkamp (ND) and Joe Manchin (WV) are in some danger but should pull through as long as the Democrats are hitting 2012+ margins. And some states once thought as unwinnable could be coming into play. In Tenneesee, the former Democratic governor who won around two thirds of the vote when he presided over the state is leading according to a recent poll. Texas is seeing an insurgency in the form of Beto O'Rourke, but the odds there are admittedly stacked heavily against the Dems due to Republicans leading heavily in party-ID and the reliance on Democrats for urban centers like Austin and lack of support in rural areas. Both seats in Mississippi are up for grabs, but there would need to be serious African-American turnout and Republican blunders for them to lose either of these seats. As it happens, a neo-confederate is actually vying for the Republican nomination, so I wouldn't write off an upset. But only in the seat that nominates the crazy.
All in all, however, I'd probably put Democratic odds of retaking the Senate at around 20-30%. For the House, though, it's more like 70%. The special election results thus far would suggest a considerably more optimistic picture, but it's uncertain whether the conditions in special elections could be replicated, what with the incumbency effect and all. But given Trump's approval, I can't see how this won't be some sort of wave for Democrats.