It wouldn’t be election eve if pollsters weren’t nervous.

At a base level, the final surveys in the states that will determine which party controls the Senate next year fall into two camps. Polls from Republican-affiliated firms point to a GOP victory — and perhaps even a romp through some blue-tinted states.

But independent polls — many of which underestimated then-President Donald Trump in 2020 — suggest Democrats still have a shot to hold off the GOP in the most competitive races on the map.

« I’m cautiously optimistic, » Charles Franklin, who runs Marquette Law School’s polling in Wisconsin, said Monday, days after his final poll pegged both the state’s marquee Senate and governor’s races as toss-ups. « But having been burned in ’16 and ’20, I’m not overconfident. »

Another academic pollster, Lee Miringoff of Marist College in New York, said the polls his institution produced — which showed Democrats narrowly ahead in Arizona and Pennsylvania, and tied in Georgia — « looked reasonable. »

« But, then again, compared to what? » he asked rhetorically. « It’s fair to say there’s a higher uncertainty this time around.

So what will it mean if Tuesday is a GOP rout that nets the party dozens of House seats and easily delivers the Senate majority?

« At the simplest level, it means nothing we’ve done since 2016 has fixed the problem » of inaccurate public polling, said Marquette’s Franklin, asked to answer the hypothetical.

Here is the final edition of our Senate polling roundup. It reflects the polling averages at RealClearPolitics as of 8 p.m. Eastern Monday night. The 10 races listed below are the ones rated « Lean Democratic, » « Toss Up » or « Lean Republican in POLITICO’s Election Forecast.

1.

Arizona

MARK KELLY (D) vs. Blake Masters (R)
POLITICO Election Forecast rating: Toss Up
RCP polling average: Kelly +0.6 (Friday: Kelly +1)
Final 2020 RCP polling average: Biden +0.9
Eventual margin: Biden +0.3

Arizona looks like a dead heat. The final poll came from the Democratic firm Data for Progress, which showed Republican Blake Masters at 50 percent and Democratic Sen. Mark Kelly at 49 percent. It’s the only poll in the RealClearPolitics database ever to show Masters ahead.

2.

Colorado

MICHAEL BENNET (D) vs. Joe O’Dea (R)
POLITICO Election Forecast rating: Lean Democratic
RCP polling average: Bennet +5.7 (Friday: Bennet +5.3)
Final 2020 RCP polling average: No average
Eventual margin: Biden +13.5

Only one new poll in Colorado since the weekend — from the aforementioned Data for Progress — and it gave Democratic Sen. Michael Bennet a 7-point lead over Republican Joe O’Dea, 51 percent to 44 percent.

If Bennet does get 51 percent on Tuesday, it would mark the first time he’s won a majority of the vote. He was first elected in 2010 with 48 percent, and he won a second full term with just a tick under 50 percent in 2016.

3.

Georgia

RAPHAEL WARNOCK (D) vs. Herschel Walker (R)
POLITICO Election Forecast rating: Toss Up
RCP polling average: Walker +0.6 (Friday: Walker +0.4)
Final 2020 RCP polling average: Trump +1
Eventual margin: Biden +0.3

A spate of public polls over the weekend — most conducted by firms with Republican affiliations — show either a dead heat or Republican Herschel Walker ever-so-slightly ahead.

The polling suggests Walker has slightly better odds of receiving more votes on Tuesday, but the state’s runoff threshold (50 percent plus one) is a possible factor. In the Senate election two years ago, then-GOP Sen. David Perdue outpaced Democrat Jon Ossoff on Election Day, only to see Ossoff come back and overtake him in the runoff two months later.

4.

Nevada

CATHERINE CORTEZ MASTO (D) vs. Adam Laxalt (R)
POLITICO Election Forecast rating: Toss Up
RCP polling average: Laxalt +2.7 (Friday: Laxalt +1.9)
Final 2020 RCP polling average Biden +2.4
Eventual margin: Biden +2.7

The final polls in Nevada were good news for Republican Adam Laxalt, who led in both surveys released over the weekend, though by varying 2- and 6-point margins.

A Cortez Masto victory would mean overperforming her poll numbers, but there’s some precedent for that: In 2018, now-Sen. Jacky Rosen was tied in the final RealClearPolitics average with then-Sen. Dean Heller, but she beat Heller by 5 points.

5.

New Hampshire

MAGGIE HASSAN (D) vs. Don Bolduc (R)
POLITICO Election Forecast rating: Toss Up
RCP polling average: Hassan +1.4 (Friday: Hassan +0.8)
Final 2020 RCP polling average: No average
Eventual margin: Biden +7.2

Three late polls all showed Democratic Sen. Maggie Hassan slightly in front of Republican Don Bolduc by 1-to-3-point margins — including a University of New Hampshire survey that had Hassan on top, 50 percent to 48 percent.

6.

North Carolina

Ted Budd (R) vs. Cheri Beasley (D)
POLITICO Election Forecast rating: Lean Republican
RCP polling average: Budd +6 (Friday: Budd +5)
Final 2020 RCP polling average: Trump +0.2
Eventual margin: Trump +1.3

Of the polls in the RealClearPolitics database, GOP Rep. Ted Budd has led by 4 to 6 points in each of the last nine surveys.

7.

Ohio

J.D. Vance (R) vs. Tim Ryan (D)
POLITICO Election Forecast rating: Lean Republican
RCP polling average: Vance +8 (Friday: Vance +5)
Final 2020 RCP polling average Trump +1
Eventual margin: Trump +8.2

The public polling suggests Republican J.D. Vance is headed for a relative blowout victory: He led Democratic Rep. Tim Ryan by 10 points in the two most recent surveys, including one from the Democratic firm Data for Progress.

8.

Pennsylvania

Mehmet Oz (R) vs. John Fetterman (D)
POLITICO Election Forecast rating: Toss Up
RCP polling average: Oz +0.1 (Friday: Oz +0.1)
Final 2020 RCP polling average Biden +1.2
Eventual margin: Biden +1.2

The closest Senate race in the country: Republican Mehmet Oz has the slimmest possible lead in the RealClearPolitics average, though the last three polls are from Republican-affiliated firms, and no polls have been added since our last update on Friday.

9

Washington

PATTY MURRAY (D) vs. Tiffany Smiley (R)
POLITICO Election Forecast rating: Lean Democratic
RCP polling average: Murray +3 (Friday: Murray +3)
Final 2020 RCP polling average: Biden +21.5
Eventual margin: Biden +20.3

Public polling ceased in October, but a super PAC backing Republican Tiffany Smiley produced a survey showing Smiley tied with Democratic Sen. Patty Murray.

10.

Wisconsin

RON JOHNSON (R) vs. Mandela Barnes (D)
POLITICO Election Forecast rating: Toss Up
RCP polling average: Johnson +3.3 (Friday: Johnson +3.2)
Final 2020 RCP polling average: Biden +6.7
Eventual margin: Biden +0.7

Data for Progress poured cold water Monday on any idea of a comeback by Democrat Mandela Barnes, showing Barnes trailing GOP Sen. Ron Johnson by 6 points, 53 percent to 47 percent.