Summary: One month after suffering a heart attack, Sen. Bernie Sanders kept up a brisk campaign schedule in Iowa over the weekend, and tried to ease voters' concerns about his health. Sanders' campaign swing followed the release of a New York Times/Siena College poll on Friday, showing him in second place in the Democratic presidential race in Iowa, three points behind Sen. Elizabeth Warren of Massachusetts. Sanders has a strong base of support in the state, but his physical condition and electability
