John Kerry tried to make a campaign issue out of the flu vaccine shortage. It didn’t work, but he tried. So did other senior Democrats. Today we learn that flu shots may not prolong lives among the elderly. Led by National Institutes of Health researchers, the study challenges standard government dogma and is bound to confuse senior citizens. During last fall’s flu vaccine shortage, thousands of older Americans, heeding the government’s public health message, stood in long lines to get their shots.