The story of the first few weeks of the primary season was that there was no momentum — that the winner one week would lose the next in both parties. That anti-momentum moment has passed. Barack Obama’s three victories tonight, coupled with his wins last week, indicate that he not only has momentum, but that he may already be a runaway train. John McCain probably won Virginia solely on the basis of his momentum, and it is very possible this night spells the end of Huckabee’s victories.