In the V series, aliens that look like humans take over key positions in politics, health care and law enforcement, then they methodically enslave the human race.
The reason I mention this is because some writers and public speakers such as David Icke have, for years, claimed that a reptilian race of aliens already lives among us, and that people in key positions of power are actually reptilians. Obama is a reptile, the thinking goes, and so was Bush.