Wendell Willkie ran as a Democrat in 1932, losing the nomination to FDR, then switched parties (finally) in 1939, and ran against FDR as a Republican. Somewhere around here is an original copy of "One World by Wendell Willkie" with his thanks to FDR for letting the publisher use the paper to print it. Naturally, the leftist partisan media shills pretend to be impressed by Willkie and do their tired old woe-is-me act that his alleged vision didn't win out.
When he addressed the Republican National Convention in 1940, Willkie referred to his listeners as "you Republicans."
Somewhere around here is an original copy of "One World by Wendell Willkie" with his thanks to FDR for letting the publisher use the paper to print it.
Anyone attending a used book sale at a library in the late 1960's would see dozens of copies of One World (New York: Simon & Schuster, 1943) for sale, usually for pennies. Nowadays, first editions can run around $100-$200.