Four days away from crucial midterm elections, one of the major questions is whether the Republicans will keep control of the Senate or whether the Democrats will gain enough seats to take over.

Republicans currently hold the majority of seats in both chambers of Congress. Democrats, however, hoping that could all change come on election day. The most recent polling suggests that Democrats have a grand opportunity to take back the House of Representatives.

But the fight to take back the Senate looks bleak for the Democrats. Republicans will not only cling on to control over the chamber, but they will also gain seats.

There are about 13 highly competitive Senate races, according to Cook Political Report. Out of those 13 races, eight states have a Democrat incumbent. However, six of those states voted for Donald Trump in the 2016 presidential elections. Republicans, on the other hand, have incumbents in five states. Four of those states voted for Mr Trump in 2016.

To put it simply, Democrats have more seats up for re-election than the Republicans, and the majority of these seats are in states that overwhelmingly in favour of Mr Trump in 2016. In fact, Trump won 10 out of 13 states with close Senate races.

Statistical analysis website FiveThirtyEight predicts that Republicans have a 6 in 7 chance of keeping control of the Senate. There is 10 per cent chance they will win five more seats. Democrats face the same probability for netting two seats.

The hotly-contested Senate races right now are in Texas, Tennessee, North Dakota and Florida. In Texas, there is a three-point gap between Democrat Congressman Beto O’Rourke and Republican incumbent Ted Cruz. Mr O’Rourke continues to inch closer with 47 per cent of likely voters and Mr Cruz with 50 per cent.

US midterm elections: the campaign trail Show all 20 1 /20 US midterm elections: the campaign trail US midterm elections: the campaign trail President Trump speaks at a campaign rally in Missoula, Montana AFP/Getty US midterm elections: the campaign trail Vermont Senator Bernie Sanders endorses Democrat Congressional candidate Randy Bryce at a campaign rally in Kenosha, Wisconsin EPA US midterm elections: the campaign trail Oprah Winfrey interviews gubernatorial candidate Stacey Abrams in Marietta, Georgia Reuters US midterm elections: the campaign trail Democrat US Senator Bob Menendez stands with representatives from local police and fire departments during a campaign event in Jersey City, New Jersey EPA US midterm elections: the campaign trail Democrat candidate for Senate Beto O'Rourke addresses supporters in Carrollton, Texas Reuters US midterm elections: the campaign trail Democratic congressional candidate Angie Craig and US Representative Tim Walz at a campaign event in Mendota Heights, Minnesota AFP/Getty US midterm elections: the campaign trail Protesters of President Trump outside a campaign rally in Rochester Minnesota AFP/Getty US midterm elections: the campaign trail Supporters of President Trump outside a campaign rally in Rochester Minnesota AFP/Getty US midterm elections: the campaign trail Florida Republican gubernatorial candidate Ron DeSantis, left, shakes hands with Democratic gubernatorial candidate Andrew Gillum after a debate on CNN AP US midterm elections: the campaign trail President Trump takes the stage at a rally in Elko, Nevada Reuters US midterm elections: the campaign trail President Trump addresses a rally in Elko, Nevada AFP/Getty US midterm elections: the campaign trail Donald Trump T-shirts for sale at a rally in Rochester, Minnesota AFP/Getty US midterm elections: the campaign trail John Lombardo talks with voters on the doorstep in Wilkes Barre, Pennsylvania AFP/Getty US midterm elections: the campaign trail Democrat Senator Joe Manchin hugs supporters as he marches in a homecoming parade in West Virginia AFP/Getty US midterm elections: the campaign trail A supporter holds up a sign at a Trump rally in Chattanooga, Tennessee EPA US midterm elections: the campaign trail Supporters of Republican congressional candidate Pete Stauber attend a campaign event in Crosby, Minnesota AFP/Getty US midterm elections: the campaign trail Former President Barack Obama joins Democrat Congresswoman Jacky Rosen on stage in Las Vegas at a rally for her Senate candidacy EPA US midterm elections: the campaign trail Members of the Culinary Union prepare packets for canvassing for the Democrats in Las Vegas AP US midterm elections: the campaign trail Republican volunteer Jess Morgan, 69, campaigns for her party in Shavertown, Pennsylvania AFP/Getty US midterm elections: the campaign trail Native American candidate Deb Haaland who is running for Congress in New Mexico AFP/Getty

Florida sees an even tighter race with Democrat incumbent Bill Nelson holding a two point lead (49 per cent) over his Republican challenger Rick Scott, the Sunshine State’s governor. As of right now, Tennessee leans Republican with incumbent Marsha Blackburn edging out former Democratic Governor Phil Bredesen with a 4-point lead. The most recent poll show 49 per cent of voters backing Mr Blackburn and 45 per cent for Mr Breesend, which is a complete turnaround from a mid-September CNN poll when Mr Bredsend had a five-point lead.

It is no doubt that this is a high stake midterm election cycle. If Republicans do end up gaining more control over the Senate, there is one possible bright side: Democrats have a bit of advantage in 2020.

Republicans will be defending significantly more seats than Democrats with 22 seats up for re-election. Thus, providing Democrats will more chances to gain seats and play an offensive strategy to regain control over the Senate.

Support free-thinking journalism and attend Independent events

FiveThirtyEight predicts the main targets for Democrats in 2020 will be Colorado Senator Cory Gardner and Maine Senator Susan Collins since they are two Republicans who are up for re-election in states that voted in favour of Democrat Hillary Clinton. Collins will be exposed to several vulnerabilities since her vote for Brett Kavanaugh, who was publicly accused of sexual assault misconduct, effectively confirmed him as a Supreme Court Justice. The vote prompted activists to form a crowdfunding campaign for her 2020 Democrat opponent and raised $3 million. Although no one has yet to file to run against Collins in 2020, former UN Ambassador Susan Rice expressed interest.

There are also four more GOP Senators up for re-election in states that lean Republicans by less than 20 points that could potentially give Democrats an opportunity to win seats. FiveThirtyEight, however, notes that there will still be challenges for Democrats: “Of course, it’s not a given that Democrats will add any seats at all to their total in 2020: Sen. Doug Jones faces an uphill fight in deep-red Alabama. What’s more, six more Democratic seats are also plausibly vulnerable.”