The four senators running for president will mostly be off the campaign trail in the final days before Iowa votes. They'll work around the impeachment trial with Skype, surrogates and red-eye flights.
Nearly a third of Iowa's 99 counties swung from voting for Democrat Barack Obama in 2008 and 2012 to Republican Donald Trump in 2016. Howard County saw the biggest swing.
Democratic presidential candidates and the pundits who discuss them throw out a lot of terms describing plans for a new and improved health care system. But what do they all mean?
State Auditor Rob Sand is often mentioned as a potential candidate for higher office but despite being courted by Democratic presidential campaigns, Sand says endorsements "barely" matter "at all."
Iowans say he's charismatic, but polls suggest they're not willing to caucus for him. Why has the New Jersey senator not taken off in the Democratic presidential primary?
The former vice president blasted President Trump's decision to kill Iranian Maj. Gen. Qassem Soleimani. So too did Sens. Bernie Sanders and Elizabeth Warren.
Most Democratic voters say they could change their minds about whom they support. So be prepared for surprises as voting begins in the Democratic nominating contests next month.
The former secretary of housing and urban development and former San Antonio mayor was among the first to advocate for decriminalizing illegal border crossings. Other candidates followed his lead.
Bernie Sanders boosted his national reputation by filibustering a tax deal brokered by Joe Biden. Years later, the two are fighting for the Democratic presidential nomination.
Iowa is more than 90% white. But the state's demographics are slowly changing, and the 2020 campaigns have expanded their efforts to court Latino, Asian and black voters there.
Fans of "Medicare for All" are betting that most Democrats who vote have moved left since 2008, at least on health care. But results from a mix of recent polls suggest voters' views aren't clear-cut.
The Judiciary Committee takes up impeachment, and the president has a chance to present a defense if he wants to. Meanwhile, there's more jockeying for position in the Democratic race.
The New Jersey senator sat down for NPR's interview series Off Script and was asked by an undecided voter why some residents in his hometown of Newark don't see him as "the voice" of black youth.
The New Jersey senator and presidential hopeful says Congress must take action. "Politics be damned. I have a job to do, which is to hold the executive accountable and we should be doing that."
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