Ron Paul ends Campaign but not Presidential Bid
Basically he's realized that since the delegate system is so divorced from the actual voting that there's no point in continuing to spend millions of dollars trying getting votes from the people. He's instructed his cult members to continue trying to stuff the delegation committees.
I think its really interesting that Ron Paul hasn't made a point of how broken the democratic system is when that is a valid strategy. It's a reasonable point and seems in line with his views.