PoD -- 1968, MLK Jr survives attempt
Charleton Heston (1981-88) (10th)
Robert Kennedy Jr. (2001-08) (15th)
George HW Bush (1989-96) (19th)
Edward Muskie (1973-80) (22nd)
Jack Kemp (1997-2000) (29th)
Richard Nixon (1969-72) (31st)
Previous presidents are as OTL, thus finding similar places on the list
EDIT ADD: Mitt Romney (2009-current) (too soon to rank)