Davis was a registered Democrat and supported John F. Kennedy 's 1960 election campaign as well as Robert F. Kennedy 's 1968 campaign . John F. Kennedy would later refuse to allow Davis to perform at his inauguration on account of his marriage with the white actress May Britt . Nancy Sinatra revealed in her 1986 book '' Frank Sinatra : My Father '' how Kennedy had planned to snub Davis as plans for his wedding to Britt were unfolding . He went on to become a close friend of President Richard Nixon and publicly endorsed him at the 1972 Republican National Convention . Davis also made a USO tour to South Vietnam at Nixon 's request
1972 Republican National Convention
1972 Republican National Convention
Sammy Davis Jr.