THE salient difference between '16 and now is two
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Additionally the combination of much higher early voting numbers, and the 'unknowable leanings' of the many newly registered voters,
argue for a 'blue wave' if not a 'blue tsunami. election.
I think we both know who the 'new' are.
And don't g\forget governorships, those too are a referendum on the GOP and on Trump.
Mostly, it's just off year history and vulnerabilities. The Dems are vulnerable in those Red State Senatorial races, because those simply are the ones that are up.
In '20, that reverses. Many, many more GOP senators from blue and purple areas are up, and vulnerable. MUCH more vulnerable with the Mueller Report findings out.