Scott Detrow

Updated at 1:40 p.m. ET

Security concerns have prompted the Democratic National Committee to recommend nixing a plan that would have allowed Iowans and Nevadans to remotely caucus for candidates next year.

Supporters have long argued that "virtual caucuses" would open up Iowa's first-in-the-nation presidential contest, which requires caucusers to physically attend sometimes hours-long events to declare their choice for president.

Former Vice President Joe Biden plays up his Pennsylvania roots as much as anything and has heavily courted organized labor in his presidential campaign, but a key union in Biden's backyard is feeling neglected by the leading Democratic candidate.

Sens. Elizabeth Warren and Bernie Sanders are campaigning on "big structural change" and "political revolution." Former Vice President Joe Biden thinks voters will weigh the "soul of America" as they decide whom to support.

Sen. Kamala Harris is making a different bet.

The California senator's campaign is increasingly focused on economic challenges that, as she framed it at the Iowa State Fair this weekend, wake voters up in the middle of the night.

Before the first presidential debate last month, former Vice President Joe Biden's campaign signaled that he expected to be attacked by the candidates trailing him in the polls but that Biden would essentially ignore all incoming fire.

It was a classic front-runner approach. And it was punctured, hard and fast, by California Sen. Kamala Harris' attack on Biden's past opposition to federal busing policies.

Updated at 3:00 p.m. ET

President Trump has made undoing the Obama Administration's foreign policy record one of his top priorities. So it's no surprise that former Vice President Joe Biden — who played a key role in implementing now-abandoned agreements like the Paris climate agreement and the Iran nuclear deal, sees Trump's foreign policy as a disaster.

Massachusetts Sen. Elizabeth Warren spent most of the spring as the Democratic presidential hopeful on the rise.

Her poll numbers steadily ticked up, as she carved out a spot as a policy-focused candidate whose weekly plan rollouts set much of the broader campaign agenda.

The momentum translated to fundraising. Warren took in $19.1 million in April, May and June — more than three times what her campaign raised during the first quarter of 2019, according to her campaign Monday.

One of Vermont Sen. Bernie Sanders's most animated moments in Thursday night's Democratic debate came after California Rep. Eric Swalwell urged voters to "pass the torch" to a new generation of leaders.

Swalwell's critique was aimed at former Vice President Joe Biden. But despite the fact that Sanders has been increasingly critical of Biden's policy positions, the independent Senator tried to rush to his fellow septuagenarian's defense. "As part of Joe's generation, let me respond," he urged the moderators in the middle of a candidate free-for-all.

Updated at 1:15 p.m. ET Thursday

A former vice president, four senators, a representative, a former governor, a mayor and a pair of entrepreneurs walk onto a stage ... where 10 other candidates tried to get their messages across to voters on Wednesday night.

Millions of television viewers are getting their first extended look at the historically sprawling Democratic primary field over two nights in Miami this week.

Updated at 6:30 p.m. ET

The day after former Vice President Joe Biden recalled his "civil" and productive working relationships decades ago with two longtime segregationist and racist fellow lawmakers, fellow Democrats are pouncing.

At a New York City fundraiser Tuesday night, Biden told donors he has reached across the aisle throughout his career. "I was in a caucus with James O. Eastland," Biden said, according to a pool report. "He never called me 'boy'; he always called me 'son.' "

What will the first Democratic presidential debates look like at the end of this month?

We got our first glimpse Saturday in San Francisco.

First, we saw the visual of candidate after candidate — 11 in all, with 3 more to come Sunday — parading across the stage at the California Democratic Party's annual convention.

This weekend, 14 presidential candidates will converge on San Francisco for the California Democratic Party's annual convention.

It will be the largest gathering of presidential contenders so far, and the latest sign that California's days of bringing up the rear of the presidential primary calendar are long gone.

The past few presidential campaigns, environmental activists have "been left begging for there to be a single question at a campaign debate about climate change," longtime climate change activist and author Bill McKibben recently told NPR.

Updated at 6:05 p.m. ET

Eight Democratic presidential candidates faced the same basic question today in Houston: Why should women of color vote for them?

The first-ever She The People Presidential Forum — organized by and centered on questions from women of color — served as a repeated reminder of the key role that minority women play in Democratic politics.

Democratic presidential hopefuls are betting on bold.

The majority of the Democrats running for president want to create a national health insurance program. Several want to do away with private health insurance entirely. Candidates are engaging on questions about reparations for slavery, and most of the White House hopefuls have endorsed the goal of a carbon-neutral economy within the next decade.

Increase the size of the U.S. Supreme Court? Several candidates are now on board.

Looking out over a crowd of firefighters chanting, "Run, Joe, run," former Vice President Joe Biden urged patience.

"Save it a little longer; I may need it in a few weeks," he said, adding, "Be careful what you wish for."

Biden isn't officially running for president — at least not yet — but Tuesday's speech to the International Association of Fire Fighter's annual conference blocks from Capitol Hill served as the latest warmup act to a potential 2020 campaign.

Most of the Democrats running for president want to create a national single-payer health care system. They want to begin a massive transition from fossil fuels to clean energy. They want to legalize marijuana, pass broad family leave policies, and do a whole lot of other things that previous generations of presidential candidates have balked from fully endorsing.

Sen. Bernie Sanders of Vermont is giving it another go, launching a second campaign for the White House four years after surprising Democrats with a strong bid for the party's 2016 nomination.

"We began the political revolution in the 2016 campaign, and now it's time to move that revolution forward," the independent senator told Vermont Public Radio in an interview airing Tuesday morning.