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Voters across the country head to the polls on Tuesday for pivotal midterm elections, with control over both the Senate and House of Representatives up for grabs.
Currently 50 Senators caucus with each of the main parties, with Joe Biden's Democrats holding a waifer thin majority thanks to the vice-president's deciding vote.
However, the GOP is hoping to win the Senate, allowing them to torpedo Biden's legislative agenda during the next two years of his presidency.
According to analysis by polling experts FiveThirtyEight, Republicans have a 54 percent chance of winning the Senate, though they are strongly favored for a House victory.
Based on recent polls, election website Real Clear Politics has concluded there are 44 seats which favor the Democrats, with 41 of these judged by be either "safe" or not up for election.
Correspondingly the site lists 48 Republican-leaning seats, including 42 safe or not being contested.
Thus, control of the Senate is likely to be determined by eight "toss-up" races across the country.

To retain their current Senate majority, assuming other contests go as expected, the Democrats must win six of these high stake's Senate elections.
The Real Clear Politics "toss-up" states are Washington, Nevada, Arizona, Colorado, Wisconsin, Georgia, Pennsylvania and New Hampshire.
Of the eight, the six where the Democrats are currently polling best, thus offering their most likely path to victory, are Washington, Colorado, Arizona, Pennsylvania, New Hampshire and Georgia.
Currently the Democrats have the advantage in Colorado and Washington, where they're ahead by 5.3 percent and 3.0 percent respectively, according to the Real Clear Politics poll of polls updated on November 2.
Biden's party is also slightly ahead in Arizona and New Hampshire, where it has leads of 1.0 percent and 0.8 percent.
In Arizona incumbent Senator Mark Kelly leads Blake Masters by 48.2 percent to 47.2 percent.
The two toughest races for the Democrats, according to Real Clear Politics, are Pennsylvania where Republican Dr. Mehmet Oz has a 0.1 percent lead over John Fetterman, and Georgia where the GOP's Herschel Walker leads Raphael Warnock by 0.4 percent.
Donald Trump will hold a rally in Pennsylvania on Saturday night, in support of Oz.
President Biden and former President Barack Obama will also campaign in the Keystone State on Saturday for Fetterman.
Speaking to Newsweek Michael Sozan, a senior fellow at the Center for American Progress, warned that "election deniers" are standing for office in numerous races.
He said: "Americans who value democracy must elect candidates who will defend democracy instead of candidates who spread the dangerous myth of widespread voter fraud and try to sabotage valid election results."
About the writer
James Bickerton is a Newsweek U.S. News reporter based in London, U.K. His focus is on covering news and politics ... Read more