(CNN) — Republican Sen. Kelly Loeffler and her Democratic opponent Rev. Raphael Warnock traded sharp attacks during a debate Sunday evening ahead of a pivotal runoff election next month.

The outcome of their race, along with the result of a second Georgia runoff in January between incumbent Republican Sen. David Perdue and his Democratic challenger Jon Ossoff, will determine control of the Senate in the new Congress.

If either Republican incumbent holds onto their seat, the GOP will be poised to maintain its Senate majority. But if both Democrats win, it would bring the balance of power to 50-50 in the upper chamber with Vice President-elect Kamala Harris able to step in and cast tie breaking votes.

Here are four key takeaways from the Warnock-Loeffler debate:

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