Marriage is a sacred and Holy institution, and should be established between a man and a woman.
However, it is under attack.
Over 50% of first marriages in this country end in divorce. The numbers in the LDS community are even high. LDSSingles.com has over 1000 active women with 100 miles of Salt Lake that list themselves as divorced.
Add in all of the marriages that are in trouble because of money issues/abuse/etc., and we have a serious epidemic on our hands.
And the Federal Marriage Amendment will do nothing to counteract the things harming the institution of marriage.
It will be like attacking Iraq in response to 9/11. 'Cause stuff like that would never happen....