Humphrey did not enter any of the 13 state primary elections , but won the Democratic nomination at the party convention in Chicago , even though 80 percent of the primary voters had been for antiwar candidates . The delegates defeated the peace plank by 1,567 to 1,041 . Humphrey selected as his running mate Senator Ed Muskie of Maine . Unfortunately for Humphrey and his campaign , in Grant Park , just five miles south of International Amphitheater convention hall ( closed 1999 ) , and at other sites near downtown Chicago , there were gatherings and protests by the thousands of antiwar demonstrators , many of whom favored McCarthy , George McGovern , or other antiwar candidates . Chicago police attacked and beat these protesters , most of them young college students , which amplified the growing feelings of unrest in the general public
party convention
1968 Democratic National Convention
Hubert Humphrey