Subject: Re: The 25th
Republicans: 53 seats
Democrats: 45 seats
Independents (caucusing with Democrats): 2 seats (Bernie Sanders and Angus King)
Total Democratic-aligned seats: 47

This part is correct.

Total seats "contested" in 2026: 35 (22 currently Republican-held, 13 currently Democratic-held).

Also correct.

To find the total, we add the seats Democrats already hold (that are not up for election) to the 35 seats they would win in this sweep scenario:

No. This double counts the seats that Democrats already hold and that are up for election. You need to add the seats Democrats already hold to the 22 “contested” seats that are currently Republican held.