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Maine Gov. LePage is term limited and there are 4 Republicans running to replace him. Photo: Gabe Souza/Portland Press Herald via Getty Images

Five states have primary elections today, bringing the nationwide total of states that have held primaries this cycle to 21.

What to watch: Keep your eyes on governor's races in Maine, Nevada and South Carolina, as Democrats are competing to replace their state's Republican chief executive. Both sides have been pouring record amounts of money into gubernatorial races across the country.

Why it matters: There are 36 governor's races happening this cycle, and 26 of them will have the power to approve or reject new congressional maps that will be redrawn after the 2020 census.

Governor's races

Maine: The four GOP candidates running to replace Governor Paul LePage have all tried to present themselves as closely aligned with him. (One candidate has an ad featuring LePage's wife while another says he'll "put the gas pedal" to LePage's accomplishments.)

  • But Republicans have reason to worry. Control of Maine's governor's mansion has consistently changed parties in every election since 1955. And EMILY's List invested $300,000 behind the leading Democratic female candidate, making it the biggest outside group contribution to the gubernatorial race.

Nevada: The state hasn't had a Democratic governor since 1999. The top two Democratic candidates, Christina Giunchigliani and Steve Sisolak, are within three points of each other and and the punches continue to fly. Sisolak accused his challenger of having "single-handedly protected perverts." EMILY's List intervened and put $2 million behind Giunchigliani.

  • The other side: Whoever wins will likely face Republican Adam Laxalt, who supported President Trump in 2016 and is backed by conservatives like Sheldon Adelson and the Koch-aligned group Americans for Prosperity.

South Carolina: The incumbent Republican Governor Henry McMaster is running for his first full term (he replaced Nikki Haley when she joined the Trump administration.) He has the president's backing, which should help his chances, but with three Republican challengers he could end up in a runoff later this summer.

  • The flip side: James Smith is the leading Democratic candidate. He's been a state lawmaker for about 20 years, is a veteran, and has former Vice President Joe Biden's support.

Go deeper: Tonight is the first time voters in Maine are using their new election system, where candidates are ranked by preference and votes are redistributed to each voter's next highest choice until a candidate exceeds 50% of the vote.

Go deeper

Democrat Mark Kelly sworn in to U.S. Senate

Photo: Courtney Pedroza/Getty Images

Astronaut Mark Kelly (D) was sworn in to the U.S. Senate on Wednesday after defeating incumbent Sen. Martha McSally (R-Ariz.) last month for the seat once held by the late Sen. John McCain.

Why it matters: Kelly's swearing-in by Vice President Mike Pence narrows the Republican majority and moves the Senate balance to 52-48.

Senate Armed Services chair dismisses Trump threat to veto defense bill

Sen. Jim Inhofe. Photo: Anna Moneymaker/Pool/AFP via Getty Images

Sen. Jim Inhofe (R-Okla.), chair of the Senate Armed Services Committee, told reporters Wednesday that he plans to move ahead with a crucial defense-spending bill without provisions that would eliminate tech industry protections, defying a veto threat from President Trump.

Why it matters: Inhofe's public rebuke signals that the Senate could have enough Republican backing to override a potential veto from Trump, who has demanded that the $740 billion National Defense Authorization Act repeal Section 230 of the Communications Decency Act.

Scoop: Uber in talks to sell air taxi business to Joby

Illustration: Sarah Grillo/Axios

Uber is in advanced talks to sell its Uber Elevate unit to Joby Aviation, Axios has learned from multiple sources. A deal could be announced later this month.

Between the lines: Uber Elevate was formed to develop a network of self-driving air taxis, but to date has been most notable for its annual conference devoted to the nascent industry.