Resolution criteria
An Independent who formally caucuses with either the Democrats or Republicans will be treated as belonging to that respective party for the purpose of resolution.
Stay a Democrat / Caucus with Democrats: Resolves to YES if Fetterman remains a registered Democrat and/or formally caucuses with the Senate Democratic Caucus.
Become a Republican to give the Republicans control (50:50 Senate): Resolves to YES if Fetterman joins the Republican Party or caucuses with the Senate Republican Conference, and this choice is the deciding factor in establishing a Republican majority (such as creating a 50-50 split with a Republican Vice President breaking ties).
Become a Republican after the election: Resolves to YES if Fetterman joins the Republican Party or caucuses with the Senate Republican Conference under any other Senate seat-share outcome. (Resolves NO if the option above resolves YES)
This will resolve on March 31st, 2027. It may be extended if active talks about changing parties are happening, but will close as soon as a consensus of media reports decide what Fetterman is doing.