With Super Tuesday right around the corner, improbable as it might have seemed even a year ago, socialist Independent Sen. Bernie Sanders is running strong in the Democratic primary. After solid showings in both Iowa and New Hampshire, there’s a significant risk that he could ultimately triumph, either outright or at a contested convention at which he holds a plurality of delegates. As FiveThirtyEight’s Nate Silver wrote last week, the model used by the data and polling analysis site is now “quite bullish on Sanders.” While it still shows as the most likely outcome that no candidate wins a majority of delegates before the convention, the model also indicates that Sanders is ultimately the “most likely Democrat to win a majority of pledged delegates.” A few factors have come into play here. About 40% of...