+4 pickup in Senate is biggest pickup in the Senate by a Presidents party in midterms since JFK 56 years ago (also +4). Btw Obama lost 63 seats in the house in 2010 (and 6 senate seats!), and Clinton lost 54 house seats in 1994 (and 9 senate seats). Both were re-elected as you all know!
They got nuthin against Trump. My money is on, they try to wipe him out with PPD (politics of personal destruction) instead of actually finding a charismatic strong liberal candidate. They will run a weenie, a compromised woman, or a party hack, and focus on trashing Trump. They always overplay their hand, and the media knob slobbers them so much, that they believe they can win that way. Its like they believe their own press.