The trainwreck presidency of Donald J. Trump continues, as it must. Most recently, the president is preparing to ban transgender soldiers from the military, and has picked a big fight with Senate Majority Leader Mitch McConnell for no reason. With all the failure, bigotry, infighting, and Trump's crashing popularity, Democrats are anticipating big pickups in the 2018 midterms — possibly big enough to overcome Republican electoral shenanigans. But they are running into a money problem, and from an unexpected source: small donors.