It was almost inevitable. On the heels of a fairly aggressive spot TV campaign for Keystone Light, (which is up a big 17% in IRI scans), A-B's Natural Light (only up 4% on a bigger base) is now getting a national TV ad campaign of its own for the first time since the Reagan Administration. The story was broken yesterday by Jeremiah McWilliams at the St. Louis Post-Dispatch (well done, Jeremiah) ..