What to Watch in Tuesday's Primaries

The last round of primaries will be held in Rhode Island, New Hampshire and Delaware on Tuesday to select new senators, House members and governors.

Rhode Island: Senator Sheldon Whitehouse (D) faces a primary challenge from Mike Costa, a former Republican candidate for governor who is now a registered Democrat. Costa has loaned his campaign $200,000, and Whitehouse has more than $3.6 million in the bank. So far, Costa has spent $50,000 on broadcast advertising, and Whitehouse has spent more than $310,000. On the Republican side, state Representative Patricia Morgan faces Ray McKay in the Senate primary.

New Hampshire: Both Governor Chris Sununu (R) and longtime Representative Annie Kuster (D) are retiring, and both races have competitive Republican and Democratic primaries. In the primaries for Governor, former Senator Kelly Ayote is leading former state Senate president Chuck Morse 65% to 21% in the Republican primary, according to FiveThirtyEight, and Manchester Mayor Joyce Craig is leading Executive Council Member Cinde Warmington 39% to 30% in the Democratic primary. In the primary for the 2nd Congressional District, author and economist Vikram Mansharamani has a slight lead in the Republican primary field with 21%. The Democratic primary has been filled with more mudslinging than the Republican side; the candidates are political operatives Colin Van Ostern and Maggie Goodlander.

Delaware: The race to watch here is the race for Governor, where Governor John Carney (D) is term-limited and is instead running for Mayor of Wilmington. Each party has three candidates in the Gubernatorial primaries, though the Cook report calls the seat "solidly Democrat". Lieutenant Governor Bethany Hall-Long, who is facing an audit of campaign filings, is running against New Castle County Executive Matt Meyer and former Delaware Secretary of Natural Resources and Environmental Control Collin O’Mara on the Democratic side.