Bulletin Today | PoliticsPreviously, we summarized the parts of the Democratic and Republican party platforms dealing with issues important to older Americans, including Social Security and Medicare, and what each side would do to promote retirement security — a broader catch-all that includes everything from affordable senior housing to food prices. But Democratic President Barack Obama and his Republican challenger, former Massachusetts Gov. Mitt Romney, won’t be the only candidates for the nation’s highest office. In many states, third-party candidates from the Libertarian and Green parties …