Hillary won't be as toxic to Congressional candidates as Obama is. We'll retake the Senate with her coattails in 2016, 2018 will be about even, and we'll have a shot at 60 in 2020 with Hillary's second set of coattails.
If Democrats lose the seats they're expected to lose this year, I don't see them making up a ton of ground in 2020. Pretty much all the seats they'll lose are in already red states. It's not like 2020, candidates will have good chances of picking up Arkansas, Alaska, or West Virginia again.
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