Yep, those suicide doors on that last one are front doors turned around...!
Taft's Pierce-Arrows (1909)
Hoover's Cadillac Sixteen (as in 16 cylinders)
He got beat up in the press for taking delivery of this car in 1930, during the economic crisis... Actually, the White House paid only $300-$500/ year for cars on a lease deal with the factories, and this one was sent over by Cadillac, which wanted the advertising on its new (and magnificent) Sixteen.
FDR's armored 1942 Lincoln
They kept NYC plates on it and used it for incognito transport, when they didn't want attention.