Republican Senators up for re-election in 2020.
If the Democrats can take back the White House, they will need to net three wins to control the US Senate. From today's vantage point, that looks very possible.
It is very possible that Martha McSally could lose in AZ. The astronaut husband of Gabby Giffords is running very strong and a recent poll had him leading in the race. Also, Cory Gardner could easily lose in Colorado to Hickenlooper or whomever might win the Democratic primary.
Joni Ernst could very well lose in Iowa as well as Susan Collins in Maine. Ernst was recently shouted down in one of her townhalls in Iowa over her voters desires to pass some sort of gun safety legislation. Of course, Collins recent votes have called into question her judgement.
Thom Tillis, John Cornyn, and Tom Cotton could be in much closer races than anyone presently anticipates. And there always seems to be a surprise amongst the races that everyone overlooks. This might be a year for that?
In my opinion, it is very possible for the Democrats to re-claim the Senate. The country needs them.
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https://www.270towin.com/2020-senate-election/