HALP: movie search o.o

so like, i got this incredible humpchies for a sci fi movie. but i can't remember the title. nor the story line for that matter.

all i remember is:
-it's about alien or android disguising as a human.
-he takes his name after seeing a ruined JFK poster thingy
-named himself Kenn i think.

anyone remember/know what's the name of the movie?
i've been spending 4 hours going through wikipedia for it. D:

 

Do you at least remember what year it was released in, or any actors that took part in it?

 

absolutely not. hence why i'm hitting dead end. i just remember it was sci fi and the kenn part @_@

though i saw it on tv around 2001-2004. so that kinda say it's an old movie. or at least before 2001 o.o

 

Way too many sci-fi movies that use that plotline, tbh. I can't help you unless you know something which could help narrow down the list.