Definitions:
Upset = party that won that state/district lost by >3% in 2020 election
This includes 226 Democratic Electoral Votes (includes NE-2) and 219 Republican Electoral Votes (includes ME-2).
There are 7 swing states (within 3% in 2020) namely:
NC - 16
GA - 16
AZ - 11
WI - 10
PA - 19
NV - 6
MI - 15
In total, they account for 93 Electoral Votes
See
for relevant scenarios.
OK I think
30% chance - Dems win with 300+ EVs
30% chance - Reps win with 300+ EVs
40% chance - both parties between 239 and 299 EVs
25% chance - Dems get upset (in MN, NH, NE-2, VA, NM, or ME)
25% chance - Reps get upset (in FL, ME-2, TX, IA, OH, or AK)
50% chance - no upsets
This market has the same definition of tossup
https://manifold.markets/BoltonBailey/in-a-hypothetical-election-where-ev?r=Q2hpbm1heVRoZU1hdGhHdXk