Whom does this help? Some of the Tea Partiers argued that Johnson was more authentically Tea Partiesh than Rand Paul. Will they settle for Paul now that Johnson is no longer an option? There was some real animosity between the Johnson and Paul campaigns on who best represented the spirit of the Tea Parties.
On the other hand, Johnson -- Gulf War veteran -- was stronger on national security than Paul. Grayson should pick up some Johnson supporters on that issue alone.