Poll: Clinton, Trump tied nationally
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Republican presidential nominee Donald TrumpDonald John TrumpOver 100 lawmakers consistently voted against chemical safeguards: study CNN's Anderson Cooper unloads on Trump Jr. for spreading 'idiotic' conspiracy theories about him Cohn: Jamie Dimon would be 'phenomenal' president MORE and Democratic rival Hillary ClintonHillary Diane Rodham ClintonTrump to declassify controversial text messages, documents related to Russia probe Hypocrisy in Kavanaugh case enough to set off alarms in DC Clinton: Hard to ignore 'racial subtext of virtually everything Trump says' MORE are in a tight race nationally, according to a new Bloomberg Politics poll.

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In a head-to-head matchup, both candidates are favored by 46 percent of likely voters, according to the poll.

The race has tightened since August, when Clinton had a 6-point lead over Trump.

When third-party candidates are included, Trump has a 2-point lead over the Democratic nominee, 43 to 41 percent.

Libertarian nominee Gary JohnsonGary Earl JohnsonRand Paul endorses Gary Johnson's Senate bid The Hill's Morning Report — Trump casts energy, land policies as gifts to red-state voters Poll finds Libertarian Senate candidate running ahead of GOP in New Mexico MORE has the support of 8 percent of likely voters, and Green Party nominee Jill Stein is backed by 4 percent.

Pollsters found that Clinton leads Trump by 13 points among female likely voters, 52 to 39 percent. The Democratic nominee also has a lead over her Republican rival among likely voters under 35, 50 to 40 percent.

The poll also shows that 49 percent of voters think Clinton will perform better in Monday night's first presidential debate, and 39 percent think Trump will do better.

More than 70 percent of respondents think Clinton's truthfulness is "just fair" or "poor." More than 60 percent say the same of Trump.

The poll was conducted from Sept. 21 to 24 among 1,002 likely voters. The margin of error is 3.1 percentage points.

According to the RealClearPolitics average of polls, Clinton has a 2.3-point lead over Trump, 45.7 to 43.4 percent.

Several polls over the last several weeks have shown the race between both major-party nominees tightening. The candidates will go head-to-head Monday night in the first presidential debate.