I have several ideas for you:
1. Push for polygamy. This is important because once it goes hand in hand with same-sex "marriage," you effectively give any group of people the power to create a "marriage" that provides all kinds of financial benefits and legal protections for a group of people that can be as simple as a small business or as complex as an organized crime family.
2. Have every person in your "marriage" take advantage of any government benefits or other financial concessions that are afforded to married couples. These would include Social Security benefits, exemptions from the estate tax, insurance coverage for an entire "family," etc. Sign everyone up for food stamps and free school lunches, while you're at it.
Give it 2-3 years and the whole system will collapse.
LOL!! Hafta agree. :-)