Gabriel Over the White House by Thomas F. Tweed
Paperback – Fantasy Books UK – circa 1950s
Cherry Tree Book #405 Science Fiction?
From the TVTropes.org description of the movie based on this novel, “Gabriel Over the White House is a 1933 American Pre-Code film starring Walter Huston, directed by Gregory La Cava. Newly elected President Judson Hammond is a political hack who is far more interested in cavorting with his mistress Pendola Molloy (Karen Morley) than he is with tackling the crime problem, or ending the Great Depression, or doing anything else to fix the terrible problems plaguing America in the early 1930s. Then one day he is injured in an auto accident and goes into a coma. When he wakes up, Hammond is a completely different person, a crusader who has a whole slew of radical new ideas to get America back on its feet. Radical new ideas that mostly involve a populist dictatorship.”