**FILE** An Aug. 29, 1968 file photo shows Vice President Hubert Humphrey, right, and his running mate, Sen. Edmund S. Muskie, left, with their wives at the Democratic Convention in Chicago following their nomination for president and vice president. The events that occurred in the 1968 convention left scars that have yet to fully heal 40 years later as Democrats head to Denver to nominate their next presidential candidate. It is widely believed that the 1968 convention cost Humphrey the presidential election to Richard Nixon. (AP Photo/File)