A Citizenship Test
There's a simple way to find if a potential immigrant is actually suited to become American. If he/she is found nodding in approval while reading the more asinine suggestions in this list of proposed mottoes for the United States (seen via Lileks), he/she will be rejected.
I suspect the list of mottoes could be used in Republican campaign literature as a means of discrediting liberal Democrats. Even people who are leaning Democratic might be embarrassed to be voting for the same party as those clowns.