DEMOCRATIC CONSTITUTIONS MUST BE DESTROYED BY ISLAM
Large parts of the Koran are legal code and form Islamic constitutional law. Since Muslims believe that these laws come from Allah and Mohammed they are of a higher order truth than any man-made laws. Therefore, Sharia law must replace all other forms of government.
Under Sharia law, all kafirs are second class citizens. Women can be beaten and slavery is allowed. And just as in political Islam, Sharia law cannot be reformed.
It is the long term goal of Islam to replace the US Constitution with the Sharia, since it contradicts Islam. For that matter, democracy violates Sharia law. Democracy assumes equality of all peoples. Islam teaches that a Muslim is a better person than kafirs and that the kafirs should submit to Islam. But in voting, a Muslim's vote is equal to a kafir's vote. This violates Islamic law, since a Muslim and a kafir are never equal.