John Kerry — one of Biden's highest-profile endorsers — overheard Sunday on phone at Des Moines hotel explaining what he would have to do to enter the presidential race amid "the possibility of Bernie Sanders taking down the Democratic Party— down whole."
https://www.nbcnews.com/politics/2020-election/john-kerry-overheard-discussing-possible-2020-bid-amid-concern-sanders-n1128476?cid=sm_npd_nn_tw_np