No, almost certainly not. Vampires are not actually real, as much as he behaves like one, and I doubt he has the capacity to make a self-aware joke like this. The image is also stamped with “r/totallyrealtweets” in the bottom right.

Technically yes, but we commonly refer to members of the House as congressmen/women and members of the Senate as senators. Being a senator gives you more power because there are only 100 of them compared to 435 House members, so it is a meaningful distinction to make.