Theodore H. White
"1000 percent" or "1000%" in a literal sense means to multiply by 10. In American English it is used as a metaphor meaning very high emphasis, or enthusiastic support. It was used in the 1972 U.S. presidential election by presidential candidate George McGovern who endorsed his running mate, Thomas Eagleton, "1000 percent" following a scandal, then soon after dropped him. Communication experts Judith Trent and Jimmy Trent agree with journalist Theodore H. White who called it, "possibly the most damaging single faux pas ever made by a presidential candidate."