But new polling out on Tuesday suggests the race between the two remained tight heading into the debate. A new Los Angeles Times/USC Tracking poll put Trump up three points over Clinton nationally. Another poll in North Carolina gave Clinton an edge over Trump in that crucial swing state. FiveThirtyEight's election forecast now gives Clinton only a 55.4% chance of victory. At the beginning of September, it was more than 70%.
Most pundits and journalists believed Clinton roundly won the debate against Trump. Two focus groups and a CNN/ORC poll of debate viewers agreed. The CNN poll was the only semi-scientific poll conducted of debate viewers.
RELATED: Looking back at recent presidential debates:
Looking back at recent presidential debates
Looking back at recent presidential debates
President Barack Obama (L) and Republican presidential nominee Mitt Romney share a laugh at the end of the first presidential debate in Denver, U.S., October 3, 2012. REUTERS/Jim Bourg/File Photo
President Barack Obama answers a question as Republican presidential nominee Mitt Romney listens during the first 2012 U.S. presidential debate in Denver, U.S., October 3, 2012. REUTERS/Rick Wilking/File Photo
U.S. Republican presidential nominee Senator John McCain (R-AZ) (near) answers a question as Democratic presidential nominee Senator Barack Obama (D-IL) looks at him during their debate at Belmont University in Nashville, Tennessee, U.S., October 7, 2008. REUTERS/Jim Young/File Photo
US Republican presidential nominee Senator John McCain (R-AZ) reacts to almost heading the wrong way off the stage after shaking hands with Democratic presidential nominee Senator Barack Obama (D-IL) at the conclusion of their final 2008 presidential debate at Hofstra University in Hempstead, New York, U.S., October 15, 2008. REUTERS/Jim Bourg/File Photo TPX IMAGES OF THE DAY
U.S. Republican presidential candidate John McCain (L) and U.S. Democratic presidential candidate Barack Obama (R) take part in their first 2008 U.S. presidential debate at the University of Mississippi in Oxford, Mississippi, U.S., September 26, 2008. REUTERS/Jim Bourg/File Photo
Texas Governor and Republican presidential candidate George W. Bush (R) and Democratic presidential candidate Vice President Al Gore speak during their presidential debate at the University of Massachusetts in Boston, U.S., October 3, 2000. REUTERS/Peter Morgan/File Photo
Democratic presidential nominee John Kerry (L) makes a point while answering a question during the first presidential debate with U.S. President George W. Bush, at the University of Miami in Coral Gables, Florida, U.S., September 30, 2004. REUTERS/Marc Serota/File Photo
President George W. Bush reacts during responses by Democratic presidential nominee John Kerry during their debate at the University of Miami in Coral Gables, Florida, U.S., September 30, 2004. REUTERS/Jim Young/File Photo
Republican presidential candidate and Texas Governor George W. Bush (L) and Democratic presidential candidate U.S. Vice President Al Gore both gesture toward moderator Jim Lehrer during the town hall-style presidential debate at Washington University in St. Louis, U.S., October 17, 2000. REUTERS/Jeff Mitchell/File Photo
Republican presidential nominee George W. Bush (C) laughs while Democratic presidential nominee Vice President Al Gore (R) and moderator Jim Lehrer (C) respond during the second presidential debate at Wake Forest University in Winston-Salem, North Carolina, U.S., October 11, 2000. REUTERS/Jeff Mitchell/File Photo
Republican presidential nominee Texas Governor George W. Bush (L) and Democratic presidential nominee and Vice President Al Gore debate during the last of three U.S. presidential debates at Washington University in St. Louis, U.S., October 17, 2000. REUTERS/Jeff Mitchell/File Photo TPX IMAGES OF THE DAY
President Bill Clinton (R) strolls away from his podium to talk to the audience as Republican presidential candidate Bob Dole watches during their second and final debate in San Diego, California, U.S., October 16, 1996. REUTERS/Win McNamee/File Photo
Democratic Presidential nominee Governor Bill Clinton (L) Independent candidate Ross Perot (C) and President George Bush laugh at the conclusion of their Presidential debate in East Lansing, Michigan, U.S., October 19th, 1992. REUTERS/Mark Cardwell/File Photo
Democratic presidential candidate Govenor Bill Clinton makes a point as Republican candidate President George Bush disagrees, during their third and final presidential debate in East Lansing, Michigan, U.S., October 19th, 1992. REUTERS/Mark Cardwell/File Photo
President Clinton reaches out to hug his wife Hillary following his debate with Republican presidential candidate Bob Dole at the University of San Diego in San Diego, California, U.S., October 16, 1996. REUTERS/Gary Hershorn/File Photo
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But Trump argued otherwise, citing unscientific online polls that say he won the face-off. Trump and his supporters, including Fox News' Sean Hannity, tweeted about them frequently on Tuesday.
The next presidential debate will be Sunday, October 9, at Washington University in St. Louis. The earliest polls to reflect voter opinions of Clinton and Trump following Monday's debate should be available later this week.
RELATED: RCP general election poll average - Clinton vs. Trump