Republicans, Jeb Bush and Ben Carson, and Democrats, Hillary Clinton, Martin O’Malley and Bernie Sanders spoke at the National Urban League’s conference in Fort Lauderdale. GOP frontrunner Jeb Bush explained how he’d learned his lesson, while Democratic frontrunner Hillary Clinton took on Jeb Bush’s positions on healthcare and voting rights. For deeper coverage, follow Miami Herald’s Naked Politics blog at http://miamiherald.typepad.com/ and follow Patricia Mazzei @PatriciaMazzei. Video by Jess Bal