At a time when a lot of people on the right want the Constitution to be amended to include a biblical definition of marriage, Alex Frantz of the blog Public Nuisance gives us a marriage amendment that's actually based on the Bible:

1 Marriage in the United States shall consist of a union between one man and one or more women. Marriage shall not impede a man's right to take concubines in addition to his wife or wives.

2 A marriage shall be considered valid only if the wife is a virgin. If the wife is not a virgin, she shall be executed. Marriage of a believer and a non-believer shall be forbidden.

3 Since marriage is for life, neither this Constitution nor the constitution of any State, nor state or federal law, shall be construed to permit divorce.

4 If a married man dies without children, his brother shall marry the widow. If he refuses to marry his brother's widow or deliberately does not give her children, he shall pay a fine of one shoe and be otherwise punished in a manner to be determined by law.

Go here for Alex's full post, which includes chapter-and-verse citations from the Good Book and extensive commentary.

(Thanks to Calpundit for the link.)