It is SO irritating when professional writers decend with the boobocracy. The phrase is "COULDN'T care less." Illiterates make this mistake all the time. To say that one COULD care less implies there IS room to care even less than one already does. To say that one COULDN'T care less means that one is at a ZERO on the "caring scale" which is PRECISELY where most republicans are on the issue.
Nonetheless, that is the way they say it in Noo Yawk City and the Northeast. There's no explaining it...but it is so.