For the second time in less than two years, a U.S. Senate race in Georgia will go to a runoff, this time between incumbent Democrat Raphael Warnock and his Donald Trump-backed challenger Herschel Walker.

Unlike the last time, the Dec. 6 vote will not determine whether President Joe Biden’s Democrats hold control of the Senate, where they have already secured enough seats to maintain their razor-thin majority.

But there is still a lot at stake for both parties:

Democrats held the narrowest possible majority for the past two years in the 50-50 Senate, where Vice President Kamala Harris gave them the tie-breaking vote. That’s led to plenty of headaches for Majority Leader Chuck Schumer as two maverick members of his party — Joe Manchin and Kyrsten Sinema — repeatedly blocked some legislative maneuvers.

A victory by Warnock would mean that Schumer could lose the support of one member of his caucus and still win floor votes. But he may have less opportunity for flashy moves, as Republicans will hold a narrow majority in the House of Representatives.

If Republican Walker is victorious, Schumer would be right back to where he has been the past two years, needing to cajole every single one of his senators to go along or suffer a defeat.

Both Manchin and Sinema have had outsized roles in 2021 and 2022 on some of Biden’s most prized initiatives, such as COVID-19 relief and legislation related to climate change and prescription drug costs.

Because of the 50-50 Senate divide, committee memberships are currently doled out evenly. These committees oversee a range of federal programs, from the military and agriculture to homeland security, transportation, healthcare and foreign affairs.

Tied votes in committees on legislation or presidential nominations block, at least temporarily, such measures from advancing to the full Senate. It takes time-consuming procedural maneuvers to break the committee deadlock so that the full chamber can pass bottled-up bills and nominations.

A Warnock win, would give Democrats at least one more member on each committee than Republicans, making it harder for Republicans to stand in the way of Biden’s agenda.

That could also provide Democrats with a stronger counter-balance to House Republicans, allowing Senate committees to advance more liberal legislation and nominees that, in turn, could help energize their core voters in the 2024 elections.

Democrats will face a daunting task in holding onto their majority in the 2024 elections, when they will be defending 21 seats to Republicans’ 10.

Two of those seats are in Republican-leaning states West Virginia, where Manchin is up for reelection, and Montana, where John Tester faces voters. Another five are in swing states of Ohio, Pennsylvania, Nevada, Wisconsin and Arizona, all of which will be in play during the presidential election. Given the chamber’s narrow divide, the Georgia seat could be a needed bulwark.

Warnock was elected to the Senate in early 2021 to fill the remaining two years of Republican Johnny Isakson’s term after he resigned at the end of 2019 for health reasons.

If Warnock manages to defeat Walker, he will put the seat in Democratic hands for six years — a full Senate term — at a time when the party will have to battle to hold its majority status.

A Walker win would give national Republicans a boost, having seen their standing in the state of Georgia erode toward Democrats over the last few years. A Warnock victory could indicate that Democrats are making inroads in places where they have had difficulties gaining traction in the past.