United States Presidential Election

FILE - In this Sept. 27, 2019, file photo, Counselor to the President Kellyanne Conway walks to speaks to media at White House in Washington. As the impeachment inquiry gains steam, top White House officials are pulling off a well-timed disappearing act. They’ve skipped high-profile TV shows and avoided driveway chat sessions with reporters. (AP Photo/Carolyn Kaster, File)

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Democratic presidential candidates chosen to participate in fourth debate;

FILE - In this Oct. 2, 2019 file photo, Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks during a gun safety forum in Las Vegas. Warren proposed breaking up big tech companies in March. She garnered immediate support, even from rivals such as Sen. Ted Cruz, a Texas Republican who retweeted Warren for what he said was the first time. Cruz said “she’s right — Big Tech has way too much power to silence Free Speech.” (AP Photo/John Locher, File)

FILE - In this Jan. 30, 2010, file photo, Vice President Joe Biden, left, with his son Hunter, right, at the Duke Georgetown NCAA college basketball game in Washington. Since the early days of the United States, leading politicians have had to contend with awkward problems posed by their family members. Joe Biden is the latest prominent politician to navigate this tricky terrain. (AP Photo/Nick Wass, File)

FILE - In this Sept. 19, 2019 file photo, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during the Climate Forum at Georgetown University in Washington. Bernie Sanders and Elizabeth Warren raked in more cash over the past three months than any of their Democratic rivals. (AP Photo/Jose Luis Magana)

In this image taken from video, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks we reporters outside his home, Tuesday, Oct. 8, 2019, in Burlington, Vt. His wife, Jane O'Meara Sanders listens at right. Sanders says he was "dumb" not to have listened to the symptoms he was experiencing before he was stricken with a heart attack last week. (AP Photo/Wilson Ring)

FILE - In this Oct. 1, 2019, file photo, Democratic presidential candidate U.S. Rep. Tulsi Gabbard, D-Hawaii, listens to a question during a campaign stop in Londonderry, N.H. While Gabbard is campaigning for her party's presidential nomination, she faces a strong primary challenge back home for her congressional seat from Democratic state Sen. Kai Kahele. (AP Photo/Charles Krupa, File)

FILE - In this Oct. 4, 2019 file photo, Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., speaks at the SEIU Unions For All Summit in Los Angeles. For 41 years, federal law has banned pregnancy discrimination in the workplace. But the stories tumbling out this week show it’s far from eradicated. Prompted by Warren’s claim that she was forced out of a teaching job in 1971 because she was pregnant, scores of women have shared similar stories on social media. Police officers, academics, fast food workers, lawyers, flight attendants and others say they hid pregnancies on the job or during interviews, faced demotion or demeaning comments and were even fired after revealing a pregnancy.(AP Photo/Ringo H.W. Chiu, File)

Democratic presidential candidate former Texas Rep. Beto O'Rourke speaks during the Power of our Pride Town Hall Thursday, Oct. 10, 2019, in Los Angeles. The LGBTQ-focused town hall featured nine 2020 Democratic presidential candidates. (AP Photo/Marcio Jose Sanchez)