They haven't forgotten it.
That's why they don't bring it up, and ignore it when you do.
All they care about is their tax cut, and their property values, and their office jobs, and their fancy SUVs and the vouchers they get so they can send their kids to private schools, and the fact they don't have to pay taxes to send some poor guy's kids to public schools, or to a doctor when they're sick.
As long as they get that, they really don't care how crazy or how dumb or how evil their President is. Its not their problem.