When the California Democratic Party declined to endorse Sen. Dianne Feinstein last week, it was taken as a sign that progressives might be poised to update the political order in the Golden State. Kevin de Le\xf3n, the leader of Democrats in the state Senate and a proud progressive, won 54 percent of the vote to Feinstein\u2019s 37 percent\u2014shy of the 60 percent needed to win the party\u2019s endorsement but an impressive upset nonetheless.