WASHINGTON (AP) -- Florida Sen. Marco Rubio and other ambitious Republicans eyeing a possible invitation to be Mitt Romney's running mate might want to keep 1920 in mind.
That was the last time the losing vice presidential nominee was a politician skillful and lucky enough to eventually become president.
His name? Franklin D. Roosevelt.
So one takeaway for this year's much-talked-about group of potential vice presidential candidates is simply this: If you hope to be president one day, accepting the No. 2 spot is a pretty good deal if the ticket wins -- and a possible pathway to political obscurity if it loses.