Joe Biden’s rift with progressives on display as he skips California Democratic convention

(CNN)The tensions between former Vice President Joe Biden and liberal progressives were on full display this weekend in California, where most of the Democratic Party’s presidential contenders were campaigning. Biden’s leading challengers won those audiences over by using him as a punching bag. They didn’t say Biden’s name, but they made clear references to his campaigning on the notion that Trump’s four years will be treated as an “aberration,” his calls for a return to normalcy in Washington and his prediction that Republicans will have an “epiphany” once Trump leaves the White House. “Some Democrats in Washington believe the only changes we can get are tweaks and nudges. If they dream at all, they dream small,” Massachusetts Sen. Elizabeth Warren …