TV ads are touting heroismALSO: Imaginative buzz; What friend?; Too many for TV Saturday, March 25, 2006 By Gordon Russell and Frank Donze - Staff writers TV commercials that attempt to spotlight politicians' acts of heroism in the anarchy of post-Katrina New Orleans have become a staple -- some might say an unfortunate one -- of the current campaign. Mayor Ray Nagin, Lt. Gov. Mitch Landrieu and Audubon Nature Institute chief executive Ron Forman, among others, all have sought to score points by reminding voters that they were here, doing the Lord's work, in the darkest of days. But none...