While the bottom line of Tuesday's midterm elections is clear — Democrats have taken control of the House while Republicans added to their majority in the Senate — a number of significant races have yet to be called as the sun rises on Wednesday.

Driving the news: In Georgia's gubernatorial race, Democrat Stacey Abrams has vowed not to concede against her Republican opponent Brian Kemp until "every vote gets counted." Kemp currently holds 50.5% of the vote, but the race could face a runoff if neither candidate ultimately ends up over 50%. The race has been marred by voter suppression and conflict of interest allegations against Kemp, who has presided over the election as Georgia's secretary of state.

Other outstanding high-profile races:

• In Arizona's Senate race, Republican Martha McSally is up on Democrat Kyrsten Sinema 49.3% to 48.5% with about 99.3% reporting. Per The Arizona Republic, "an official victor may not be known for days — and maybe longer, if the final tally were to trigger a recount or legal challenge."
• In Florida's Senate race, former Republican governor Rick Scott is up on Democrat incumbent Bill Nelson 50.2% to 49.8% with 100% reporting. Scott has declared victory, but the race is statistically too close to call and Nelson has called for an automatic recount, which must take place under state law if the margin of victory remains less than 0.5%.
• In Mississippi's Senate special election, Republican Cindy Hyde-Smith and Democrat Mike Espy are headed to a runoff later this month after both candidates failed to reach the 50% threshold.
• In Texas' 23rd district, one of Axios' 8 for 2018, AP withdrew its call for Republican incumbent Will Hurd at about 4 a.m. ET. The margin between him and Democrat Gina Ortiz Jones is only about 700 votes.

The previously outstanding races that have now been decided:

• In Montana's Senate race, incumbent Democrat Jon Tester defeated Republican challenger Matt Rosendale, per the AP.

Go deeper:

• See the latest midterm election results on our live map
• Two Americas after the midterm elections: amplified, tearing apart
• The 2018 midterm election races that made history