Donald Trump leads Hillary Clinton by four points following the presidential debate on Monday.

Undecideds swung to Trump over Hillary 34% to 5% .

Breitbart-Gravis Marketing reported:

Gravis Marketing, a nonpartisan research firm, in conjunction with Breitbart News Network, conducted a random survey of 890 registered voters across the United States following the first presidential debate on September 26th.

The poll has a margin of error of ± 3.3% at the 95% confidence level. The total may not round to 100% because of rounding.

The poll was conducted using automated telephone calls and weighted by voting patterns.

Founded in 2005 by conservative icon Andrew Breitbart, Breitbart News Network is the biggest source of breaking news and analysis, thought-leading commentary, and original reporting curated and written specifically for the new generation of independent and conservative thinkers.