Q: My spouse is an alocholic. Can I be sued if he causes an accident?
A: Yes. You can be sued up to the statutory limit if you are a registered owner of the car. If, however, they can prove "negligent entrustment" (a fancy term for you negligently letting him use your car) then they can sue you for the full value of the case.
You can protect yourself by getting your spouse help and trying to limit his opportunities to drive while intoxicated.