I think it's highly possible Braun and Holcomb aim a job switch. The latter could just run for the senate seat here. He's still in his mid 50s.
How many times has this happened? I know about the disastrous 1958 California attempt but that’s all.
As far as I can tell by glancing over the historical record, 2024 IN-SEN/GOV would be only the 2nd time since the turn of the 20th century that a Gov. & Sen. attempt a simultaneous elected job-switch, the first indeed being 1958 CA-SEN/GOV.
That was under different circumstances, though. Holcomb would be term-limited in 2024 anyway, so a senate bid would keep him in public office.
1958 in California was kind of a forced switch because of Knowland. Goodwin Knight actually wanted to run for reelection as governor (he came in in 1953 after Earl Warren was appointed Chief Justice was elected to an own term in 1954). Nixon supported that deal for tactical reasons, as both Knowland and Knight were considered potential rivals for the 1960 Republican presidential nomination. Both of them losing in the end cleared the way for Nixon. I personally think Knowland would have lost his bid for the senate, had they not made that deal, while Knight wins his reelection bid.
