Think Shar'ia can't happen here?

Think again.  Because that's exactly what Islamists in Tehran are shooting for, and we have an administration that has shown no ability or even intent to stand up to them.  Via Gateway Pundit:

Tehran’s provisional Friday Prayers Leader Hojjatoleslam Kazzem Sediqi underlined that the growing waves of Iran’s Islamic Revolution which have swept the Middle-East and North Africa are now spreading to the European continent and the US.
“The Islamic Revolution (of Iran), featured by confronting the US and defeating the arrogance over the past 32 years, has not only spread to the region but also reached Europe and the US now,” said Hojjatoleslam Sediqi in his second sermon to large groups of Friday prayers worshipers in Tehran University campus.
He said the movements, originating from the Islamic Revolution of Iran, are getting universalized.
Earlier, Supreme Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei had stressed that the European continent will soon experience popular uprisings and revolutions sweeping the Middle-East and North of Africa at present.

The price of liberty is eternal vigilance. Especially when it comes to foreign policy.