He just suspended his campaign. But who will he endorse?

Resolves "No one" if he makes no endorsement, even during the general election. Otherwise, resolves to the name of the next person he officially endorses for the 2024 presidential election. If he makes some weird joint endorsement, I may resolve to multiple options; however, I think this is unlikely. If he again becomes a candidate, resolves “Mike Pence.”

See also:

General policy for my markets: In the rare event of a conflict between my resolution criteria and the agreed-upon common-sense spirit of the market, I may resolve it according to the market's spirit or N/A, probably after discussion.