I would:
1. Claim to be a demonrat.
2. Take the BILLION$.
3. Announce that due to my new demonrat status, my word means absolutely nothing and everything single thing I say is a lie.
4. Move to a demonrat elitist enclave like Martha's Vineyard or The Hamptons.
5. Live happily ever after in a mansion just like all the members of the demonrat elite already have, but with even bigger, taller, high-security walls and fences.
6. Every election cycle, donate a few million$ to Republicans.
Turnabout is fair play, right?