Bulletin Today | PoliticsThe lesson is clear: If you want to win a Republican primary this election season, you’d better make a persuasive case to voters 50 and older — because they’re the ones tipping the scales in favor of the winning candidate. Older voters made the difference again yesterday on Super Tuesday, as Mitt Romney appeared to take a major step forward in his bid for the GOP presidential nomination by winning primaries or caucuses in six states. Rick Santorum won three states, …