For the letter writers who think that gay marriage and polygamy compare:
There is a lot of difference between gay marriage and polygamy. Gay marriage affects two people and polygamy affects many people and has been shown to cause many more problems for women, children and some "lost boys." It often treats women as second-class citizens.
It is handled in a different court and has been recently "decriminalized" if those practicing it don't break other laws, but in some large groups there have been underage and forced marriages and rape of young girls. Boys have been sent off with no home because the older men want to have lots of women and young girls for themselves to marry.