Rep. Jacky Rosen Jacklyn (Jacky) Sheryl RosenHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D-Nev.) holds a 4-point lead over vulnerable Sen. Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (R-Nev.), according to a new poll released a day before the pivotal midterm elections.

The Emerson College poll released Tuesday found Rosen opening up a small lead over Heller among likely voters surveyed, 49 percent to 45 percent, which is just outside the poll’s 3-point margin of error. Four percent of likely voters remain undecided in the final stretch.

Nevada’s Senate race has been one of the most hotly contested Senate races this cycle, with polls mostly showing a dead heat in the run-up to Election Day. Heller is the only GOP senator up for reelection in a state that Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE won in 2016.

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It’s a big shift from Emerson’s last poll from mid-October, which had Heller ahead by 7 points. More recent public polls have shown a much tighter race, which has given Republicans hope they can hold on to the seat and increase their Senate majority overall.

Forty-seven percent of respondents view President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE favorably, while 48 percent of respondents said they view him unfavorably. Heller has tied himself closely to Trump in his Senate campaign and has a similar but slightly lower favorability rating, 43 percent (compared to 46 percent of respondents who viewed him unfavorably). Rosen has a split favorability rating with 42 percent of respondents reporting a favorable view of her to 42 percent who said they held an unfavorable view.

The poll also found Democratic candidates leading in Nevada’s two competitive House races, where Democrats are playing defense.

In Nevada’s 3rd District, Democratic philanthropist Susie Lee holds a comfortable 9-point lead over Republican businessman and perennial candidate Danny Tarkanian. The two are competing for Rosen’s seat.

Meanwhile, in Nevada’s 4th District, former Rep. Steven Horsford Steven Alexander HorsfordThe robbing of a wildlife refuge in Nevada Rep. Steven Horsford wins Democratic House primary in Nevada Overnight Defense: Army now willing to rename bases named after Confederates | Dems demand answers on 'unfathomable' nuke testing discussions | Pentagon confirms death of north African al Qaeda leader MORE (D) is ahead of former Rep. Cresent Hardy (R) by 4 points, just outside the margins, in the race to replace outgoing Rep. Ruben Kihuen Ruben Jesus KihuenRep. Steven Horsford wins Democratic House primary in Nevada Members spar over sexual harassment training deadline Nevada Dem sanctioned for sexual misconduct announces city council bid MORE (D-Nev.).

Nevada’s gubernatorial race is much tighter, with Democrat Steve Sisolak leading Republican Adam Laxalt by just 1 point, 48 percent to 47 percent among respondents to the Emerson poll. Two percent are undecided.

The poll was conducted from Nov. 1 to 4 and surveyed 1,197 adults. The margin of error was 3 percentage points.