Is there a Muslim obligation to be loyal to a secular state?

I was reading an opinion piece in the 11/27 Christian Science Monitor by an American-born Muslim of Pakistani descent named Mansoor Ijaz, and on the same page there was an audio file of an interview he gave with with the CSM opinion editor, Josh Burek. I know nothing more about Ijaz than was on his Wikipedia page, but that doesn’t really matter for the purposes of this question.

Here is the link to the article. The sound file is to the right of the first paragraph.

At about the 6:30 mark, he says the Quran repeatedly mentions that if a Muslim chooses to live in a state not run according to Shariah law, he is then bound to fulfill all the obligations of citizenship in that country.

Can anyone help me out by pointing to a place in the Quran that says this? My Quranic knowledge is nonexistent, and I don’t even know what I would search for. I’m just curious as to what textual supports this idea has.

PLEASE-- this is in GQ for a reason. I don’t want this to become a debate; I just want some information. Other things he says in the interview are certainly debatable, as is the article itself, but that’s for another thread in another forum.

So are there any dopers out there well-versed in the Quran (hah! pun!) that can enlighten me on this one?

I can’t point to a particular part of the Quran, but I recently visited the big Islamic center here in Cleveland as part of a group from my Episcopal church. We met with the imam, who emphasized (too bad that he felt he had to, in these post-9-11 days) that Muslim Americans are still Americans, that they are loyal to and love their country, and they are permitted to swear or affirm (and be bound by) oaths of loyalty as required by the U.S. military, for instance. From all I’ve read, he’s right, and I know of quite a few Muslim cops, soldiers, and even a magistrate who have sworn official oaths and fully abide by them.

In 4:59, the Quran does say, “Obey God, and his messenger, and those in authority among you.”

Another sura whose interpretation may be relevant here is 5:48,