Heck comes out ahead of the former Nevada attorney general 45-42, with Independent American Party candidate Tom Jones behind at 4 percent.
Heck's lead in the latest poll is consistent with results from the most recent Monmouth University poll of Nevada, released in mid-September. In that race, Heck led +3, and today he maintains that +3 lead.
The Monmouth University poll was conducted via live telephone interview from Oct. 14-17 among 413 likely Nevada voters, and has a margin of error of plus or minus 4.8 percent.
TPM's PollTracker Average for the U.S. Senate election in Nevada shows Cortez Masto leading Heck, 44.6 to 42.5.