He is not from TX. He just bought a ranch here and moved in,

In fact here is his Bio...George W. Bush Biographical Information
Birthdate: 07/06/1946
Birthplace: New Haven, CT
Religion: Methodist
Family: Married, 2 daughters
Political Experience: Governor of Texas, 1994-2000 President of the United States, 2000-Present

Mal: "Y'all see the man hanging out of the spaceship with the really big gun?{ref, Jayne} Man's lookin' to kill some folk. So really, it's his will y'all should worry about thwarting."