Bernie Sanders tries on a new role in 2020: Inside player

(CNN)The episode repeated itself like clockwork during the Democratic primary: Bernie Sanders' staff, and sometimes the candidate himself, would telegraph -- often in the lead-up to a debate night -- a hot new round of attacks on former Vice President Joe Biden. Then, just as surely, Sanders would pull up short. "Joe is a friend of mine," he would offer as a caveat, "and a decent guy," before going on to lament Biden's voting record or prospects in the general election. Nearly two months after the primary effectively ended, Biden's campaign and Sanders' senior leadership have successfully crafted a ceasefire in the ideological warfare that has dominated the Democratic Party, and its...