Those same people believed there were WMDs in Iraq and that waterboarding was not torture (even though the US convicted Japanese soldiers as war criminals for using the same technique). Those same people believed Obama is a Muslim and many of them still do.
Bush and Cheney set the record for lying during 8 years in office, but Mitt Romney may have beaten them in the span of one presidential campaign.
Trump is the logical extension of the Republican brand of demagoguery.
Those 74 million voters have been drinking the kool-aid their entire lives.