Civil Rights Protection Act of 1988 - Amends the Federal criminal code to add affectional or sexual orientation to the list of protected categories under Federal civil rights laws respecting: (1) conspiracy against the rights of citizens; (2) deprivation of rights under color of law; (3) certain federally protected activities (including attending public schools, serving as a juror, and traveling in or using any facility of interstate commerce); and (4) deprivation of relief benefits.