To the Editor: A child of the Depression, I cut my political teeth on the New Deal. When I got old enough, my dad, a Teddy Roosevelt Republican who voted for Franklin D. Roosevelt, had me listen to F.D.R. on the radio and pay attention to news reels at the movies. F.D.R.’s critics responded to the New Deal the way today’s Republicans do, whining about deficits, calling the Works Progress Administration, the Civilian Conservation Corps and Social Security socialist and crying for a stop to doing much for the people. Where would seniors today be without Social Security?