Only New Hampshire and Wisconsin do not require you to buy auto insurance:
http://www.carinsurance.com/kb/content20009.aspx
Texas used to be on this list, but is no longer.
It looks like as of June 1, 2010, Wisconsin will be requiring liability insurance.
And that's an interesting point: Most (every?) states requires only liability insurance to cover injuries or damage to other people. Although a no-fault state may be different.
In Ohio, you can provide proof of financial responsibility instead of buying auto insurance.
At the risk of being sarcastic or changing the subject: Tell her you've given it a lot of thought and although you are reluctant to cede the Constitutional argument, you realize that she may have a point, maybe at the state level.
If we can cure the problem of the uninsured by requiring them to buy insurance, we can cure the problem of homelessness by requiring everyone to buy a house.
We should also require everyone to get a job, while we are at it, so unemployment goes away. Or maybe that's not logical so, instead, we should require everyone to hire someone else.
In addition, you've changed your mind about abortion. You think there may be circumstances that demand abortion - for Democrats - retroactively.
Dang, it’s that bad? I know Utah 40 years ago was on the “does not require ‘insurance’” list.