Former Vice President Joe Biden has used Barack Obama’s beloved status among Democratic voters to insulate him from criticism from the massive field of candidates jockeying to be the next president. But in recent weeks, the Democratic frontrunner has had that legacy used against him, with his competitors pointing the to shortcomings of the last Democratic administration as evidence that Biden’s not up to the task of leading the next one. “Barack Obama, personally, is incredibly popular among Democratic primary voters,” Karthik Ganapathy, a progressive consultant now running his own firm, told The Daily Beast. “And also at the same...