Should Muslims in a secular democracy try to make it an Islamic state?

Related to [this question](https://islam.stackexchange.com/q/1110/2469) : Should Muslims who live in a secular democracy (like the United States) attempt to turn the country into an Islamic state? For example, should Muslims support ammendments to the U.S. Constitution that abolish the separation of church and state and that establish Islam as the national religion of the U.S.? Should they vote for political parties that would legislate based on Islamic teachings?