For instance, here is Ronald Reagan before Medicare was created:
If this program passes, one of these years we will tell our children and our children's children what it was like in American when men were free.And of course, he was wrong. Yet that wrongness has no impact on his acolytes, who still ask "What would Reagan do?" and invoke his memory and demonstrably wrong arguments to oppose universal health care.
This is an intellectual culture for which reality is secondary to ideology. Perhaps this is part of why it's so easy for so many Republicans to convince themselves that President Obama is not a US citizen.