if we lose warren or sanders in the senate

(and they will be replaced by a republican thanks to the republican governors of those states) will we be able to flip the senate blue?

"Democrats have a challenging path to capturing the Senate in 2020. Republicans currently have a 53-47 majority, which means that to take control, Democrats will need, at a minimum, a net gain of three seats and the vice presidency (the VP breaks ties in the Senate). But even if Democrats pick up exactly three seats and win the White House, they could still miss out on controlling the Senate. How? If the new president leaves behind a vacant Senate seat in a state with a Republican governor."

snip

"The good news for Democrats is that both Massachusetts and Vermont have laws that call for expedited special elections to fill Senate seats, so an appointed Republican might not be in place very long (unless of course the appointee were to win the special election). But at least during the appointment period, Republicans would have an edge in the Senate. And that could delay confirmation of the new Democratic president’s Cabinet and judicial appointees, as well as the passage of White House-backed legislation. Other bad news for Democrats: If the appointee were to run in the special election, there’s at least a small chance that person could win and keep the seat in GOP hands."

https://fivethirtyeight.com/features/how-winning-the-white-house-could-cost-democrats-the-senate-at-least-temporarily/?fbclid=IwAR34gUjLhuPJLuA47APu5TSY6w6N3OFCScUT8kVXNqpsBOfhtAW_PGP4KTM