Ad campaigns are in the works. There are calls for massive voter mobilizations and screeds from leading donors circulating within liberal circles. Major labor groups are organizing their members on the ground in swing states. Within the Democratic Party apparatus, top elected leaders are beginning to speak out both collectively and individually in ways that reach beyond standard presidential-year posturing. The sense of urgency in some corners of the left is high enough that Massachusetts Sen. Elizabeth Warren, a progressive icon who has gone to great lengths to avoid being part of the Democratic presidential conversation in 2016, hinted on Monday that she might soon get involved with the effort to stop Trump…

Henry is a signatory to one of the most conspicuous anti-Trump efforts to date, an open letter calling progressives to arms against the billionaire. Signed by leaders of more than 20 leading liberal groups that support Hillary Clinton or Bernie Sanders, the letter described Trump in the harshest of terms and called for a massive organizing effort against him…

The question of what to do about Trump has gone from a bad joke to a topic of frequent conversation among leading Democrats, including members of Congress. As Trump has stormed toward the GOP nomination, confounding the Republican establishment and steamrolling veteran officeholders in his path, liberal leaders have come to conclude that the time has come to more seriously confront Trump — whom, they warn, could actually win the White House.