"But there's another option that is virtually risk-free and carries more upside: Joe Biden. The current vice president is universally known, vetted, and unquestionably fit to serve. As America's affable "Uncle Joe," he is viewed positively by 51 percent of the country and unfavorably by just 36 percent. He's absolutely beloved by Democrats, helping to shore up the Sanders-Warren wing of the party. And he has already proven to be an able complement to a candidate who, like Clinton, sometimes struggles to connect viscerally and emotionally with voters. He also appears to absolutely love being vice president, and is good at the job."