Sure, you might only be able to get the abstracts though. I think they are taking it even further and investigating its relation to all autoimmune diseases.

Vitamin D and multiple sclerosis. [Proc Soc Exp Biol Med. 1997] - PubMed result
Vitamin D and Multiple Sclerosis : Topics in Clinical Nutrition

Some other interesting information about Vitamin D

- Vitamin D activates your immune system to respond to any viral exposure (not just one virus), so if you are vit D deficient vaccines wont work
- Vitamin D also improves sugar metabolism, bone density and healthy moods.
- Vitamin D works on everyone and is safe for everyone, including infants and children.
- Vitamin D is found naturally in breast milk.