Senate races in Arizona, Nevada, Georgia and Pennsylvania are deadlocked in the battle for the upper house, with polling averages showing no clear advantage for either Republican or Democrat, and the candidates in each race shout that it is the victory that brings their respective party over the 50-seat threshold for a majority. In Georgia, Republican Herschel Walker leads incumbent Democratic Sen. Raphael Warnock by 1.6 percent, according to an average of Real Clear Politics (RCP) polls conducted in recent weeks, well within the margin of error. As in many races with a Democratic incumbent in a year projected to be favorable to Republicans, Walker trailed by a larger percentage earlier in the summer, but has since closed that gap despite efforts by Democrats to paint him as a fringe and not serious candidate. SURROUNDED: DEMOCRATS FORCED TO DEFEND RESTAURANT GROUND AS DEMOCRATS GROUNDED IN BIDEN’S DISTRICTS Georgia GOP Senate candidate Herschel Walker, left, and incumbent Democratic Sen. Raphael Warnock (Republican National Convention/Brief via Reuters | Tom Williams/Pool via Reuters) Arizona Republican Blake Masters has taken similar steps. While she still trails incumbent Democratic Sen. Mark Kelly by 2.3 percent, according to RCP, that lead is much smaller than the nearly 10-point lead Kelly had in September. In Nevada, Republican Adam Laxalt, a former state attorney general, leads Democratic incumbent Sen. Kathryn Cortez Masto by 1.9 percent, according to RCP, with much of his boost in support appearing to come from independent voters in the traditional battlefield state. He has maintained his lead in the average poll since he overtook Cortez Masto in September, despite the fact that the latter is seen more favorably by voters. ‘SETTING INTO HIDDEN’: JOHN FETERMAN LOSES BIG SUPPORT IN HEATED SENATE RACE In arguably the most high-profile race this year, Pennsylvania Democratic Lt. Gov. John Fetterman holds a slim 0.6 percent lead over Republican Dr. Mehmet Oz, according to RCP, one of the closest margins in the race since the primary. The rift between the two closed after continued concerns about Fetterman’s health following a stroke earlier this year and his refusal to release his medical records. His performance in the only debate between the two candidates last week was widely criticized for what appeared to be trouble speaking and processing information throughout the event. Pennsylvania Democratic Senate candidate Lt. Gov. John Fetterman, left, and Republican Senate candidate Dr. Mehmet Oz (AP Photo) A number of other Senate races across the country remain tight but without as wide a margin, including the race between Republican JD Vance and Democratic Rep. Tim Ryan in Ohio, incumbent Republican Sen. Marco Rubio and Democratic Rep. Val Demings in Florida. Republican Rep. Ted Budd and Democrat Cheri Beasley in North Carolina and incumbent Republican Sen. Ron Johnson and Democratic Lt. Gov. Mandela Barnes in Wisconsin. HOUSE DIVIDED: DEMOCRATS TURN ON PARTY LEADERSHIP AS MIDWIFE HOPE RISES DESPITE VOTER LOSS Republicans are favored in each of these races, but they have been prime targets for Democrats throughout this election cycle. The Senate is currently split 50-50 between the two parties, with Vice President Kamala Harris’ tie giving Democrats the smallest possible majority. Assuming Republicans win Ohio, Florida, North Carolina and Wisconsin, as well as every other race they’re heavily favored to win, they’ll need to win two of four critical swing seats to gain control of the Senate or one of the four positions to maintain the 50-50 split. US Capitol (AP Photo/J. Scott Applewhite) CLICK HERE TO GET THE FOX NEWS APP Fox News’ Power Rankings rate the overall Senate race as a toss-up. The general election will be held on Tuesday, November 8. Brandon Gillespie is a contributing editor at Fox News. Follow him on Twitter at @brandon_cg.