United States presidential election

Campaign signs for Republican House candidate Dan Bishop and Democratic House candidate Dan McCready, are shown in in Waxhaw, NC, outside Charlotte, Saturday, Sept. 7, 2019. McCready faces Bishop in a special election for a vacant house seat Tuesday. National Democratic and Republican leaders are breathlessly watching Tuesday’s special election for an empty House seat from North Carolina for early clues about next year’s presidential and congressional races. But for the two candidates, the race is less glamour than grind. (AP Photo/Alan Fram)

FILE - In this May 29, 2019 file photo, Missouri Gov. Mike Parson addresses the media during a news conference in his Capitol office in Jefferson City, Mo. Missouri's Republican governor, Parson, is expected to announce that he's running for a full term in office. Parson has a campaign announcement planned for Sunday, Sept. 8, 2019, near his cattle ranch in Bolivar. (Julie Smith/The Jefferson City News-Tribune via AP File)

FILE - In this Aug. 6, 2019, file photo, a woman walks by a money exchange shop decorated with different countries currency banknotes at Central, a business district in Hong Kong. China's trade with the United States fell sharply in August as a tariff war that threatens global economic growth worsened. (AP Photo/Kin Cheung, File)

Brad Parscale campaign manager for Trump's 2020 reelection campaign speaks during the California GOP fall convention on Sept. 7, 2019, in Indian Wells, Calif. (AP Photo/Chris Carlson)

In this Thursday, Sept. 5, 2019 photo, U.S. Rep. Roger Marshall, R-Kan., stands outside an RV he uses in traveling across the state to events after an Associated Press interview in Topeka, Kansas. The two-term western Kansas congressman is running for the U.S. Senate. (AP Photo/John Hanna)

In this Nov. 12, 2018 file photo, ballots are prepared for tabulation in Augusta, Maine, in the Second Congressional District's House election, the first congressional race in American history to be decided by the ranked-choice voting method. Gov. Janet Mills has until midnight Friday, Sept. 6, 2019, to sign or veto a bill that would allow ranked-choice voting in the state's March 2020 presidential primary. (AP Photo/Robert F. Bukaty, File)

FILE - In this May 15, 2019, file photo, Ninth Congressional district Democratic candidate Dan McCready answers a question during a news conference in Charlotte, N.C. There’s a do-over special election next week for an open House seat from North Carolina. And it’s providing a pre-2020 test of President Donald Trump’s popularity and whether the suburbs are continuing their flight from Republicans that hurt them in the 2018 congressional elections. Conservative Republican Dan Bishop is draping himself around Trump. Democrat Dan McCreary is an ex-Marine who’s casting himself as a centrist. The race is considered a tossup. (AP Photo/Chuck Burton, File)

Democratic presidential candidate former Texas Rep. Beto O'Rourke greets students after speaking at a event at Tufts University Thursday, Sept. 5, 2019, in Medford, Mass. (AP Photo/Winslow Townson)

Rep. Joe Kennedy III, D-Mass., talks with volunteer Paul Twomey while campaigning for Democratic presidential candidate Sen. Elizabeth Warren at the New Hampshire for Warren kick off field office opening in Manchester, N.H., Thursday, Sept. 5, 2019: (AP Photo/ Cheryl Senter)