Back in 1980, Carter semi-suspended his campaign due to the hostage crisis.  He then reversed course because it didn’t seem to help.  Odd that McCain would choose that example to emulate. 

Can’t comment further b/c I’m at work & I’ve taken enough time already finding this thing.

The actual article that spells it out is behind a wall, but here’s a link to the abstract.

hattip to H. Wasserman at prawfsblawg who asked the question that prompted me to search the archives.