Answer: Probably yes.
The writings of Tom Paine ("The Age Of Reason") are pretty explicit about it, as he refers to a 'plurality of worlds' and sees no logic in the unstated assumption in Christianity that only the earth has rational creatures on it. He wondered if the Son of God had to visit every planet to die for their sins.
Just another bit of history that gets overlooked: this country was founded by a bunch of guys who thought ET's were probably out there, somewhere.
I do have to laugh however in regard to Dr. Boylan - whose life mission is recommending belief in "Star Nations". If you go his site, he has a psychic prediction that a particular race of ET's will land and shake hands with ordinary people in the fall of of 2013......
............. in Cleveland !
What, they wanna visit the Rock And Roll Museum?