I would question a Senate campaign that expected to last on a million or two for three months.

Actually that would be a normal number for a senate race in most cases.

But you forget. If the objective is not to win or be competitive but just to remain a positive presence in the race a little money goes a long way towards that goal. Although the there is still a lot of time left, were almost through the list of actual contests. Just making a lot of visits and only a limited ad buy at the end is enough.