But Ronnie Reagan, elected in 1980, alas finished two terms. John Hinkley tried to end his first. But That hardly counts.
Zachary Taylor wasn't elected in a year ending in zero. But he died of a stroke (or maybe it was food poisoning) while still in office.

Much as I admire Tecumseh, I would rather see George W. forced to resign from office after being caught en flagranted with Karl Rove and Condoleeza Rice, preferrably at the Watergate Hotel.