Here is the veteran political writer at The Atlantic:
After two insurgent campaigns that rattled American politics, Bernie Sanders’s dream of becoming the Democratic presidential nominee is effectively over.
Tapping an enormous wave of grassroots energy in both bids for the White House, Sanders galvanized young people, transformed online fundraising, and changed the terms of debate in the Democratic Party on issues ranging from health care to college affordability. But as his defeats last night made clear yet again, his unflinching call for a “political revolution” could not build a coalition broad enough to capture the ultimate prize.
For now, Sanders is staying in the race. “While our campaign has won the ideological debate, we are losing the debate over electability,” he said today in a short speech from Burlington, Vermont. He still plans to attend an upcoming debate with former Vice President Joe Biden, who remains well short of the 1,991 delegates needed for a nomination on the first ballot at the Democratic National Convention in July. But Biden’s resounding victories last night, and his widening delegate lead, have prompted even some of Sanders’s ideological allies to question whether the senator from Vermont should continue his campaign.