June 5th
California primaries
Senate: Dianne Feinstein is up for re-election.
House: 10 out of 53 races are competitive in the general election.
California offers some of the biggest opportunities for Democrats to take back the House, given changing demographics, the decline of the Republican Party in the state and policies being pushed in Washington. Two of the most vulnerable Republicans — Ed Royce in the 39th District and Darrell Issa in the 49th District — have already announced that they are not seeking re-election.
Mississippi primaries
Senate: Roger Wicker is up for re-election.
Senator Thad Cochran’s decision to retire set off a game of musical chairs. Instead of Senator Roger Wicker defending his seat from a major rival in a Republican primary on June 5, the state’s big battle is expected in November, when there there will be a special election to finish Mr. Cochran’s term. Chris McDaniel, a state senator who almost unseated Mr. Cochran in 2014 and had previously decided to challenge Mr. Wicker, will run in a growing field for Mr. Cochran’s seat instead.
Alabama primaries
Iowa primaries
House: 2 out of 4 races are competitive in the general election.
Montana primaries
Senate: Jon Tester is up for re-election.
House: 1 race is competitive in the general election.
New Jersey primaries
Senate: Robert Menendez is up for re-election.
House: 5 out of 12 races are competitive in the general election.
New Mexico primaries
Senate: Martin Heinrich is up for re-election.
House: 1 out of 3 races is competitive in the general election.
South Dakota primaries
Senate: Martin Heinrich is up for re-election.
House: 1 out of 3 races is competitive in the general election.
June 12th
The Nevada Senate seat is crucial for Republicans.
Nevada primaries
Senate: Dean Heller is up for re-election.
House: 2 out of 4 races are competitive in the general election.
Mr. Heller no longer faces a primary fight against Danny Tarkanian, a Nevada businessman who had fiercely criticized Mr. Heller, after Mr. Trump persuaded Mr. Tarkanian to drop out of the race. In the Fourth District, Representative Ruben Kihuen, a Democrat, said he would not seek re-election after sexual misconduct accusations surfaced.
Maine primaries
Senate: Angus King is up for re-election.
House: 1 out of 2 races is competitive in the general election.
North Dakota primaries
Senate: Heidi Heitkamp is up for re-election.
South Carolina primaries
Virginia primaries
Senate: Tim Kaine is up for re-election.
House: 4 out of 11 races are competitive in the general election.
June 19
Arkansas primaries runoff
June 26
New York Democrats are energized to run in Republican-held districts.
New York primaries
Senate: Kirsten Gillibrand is up for re-election.
House: 5 out of 27 races are competitive in the general election.
Eight Democrats have combined to raise nearly $4 million in the Democratic primary to challenge Representative John Faso, a Republican, in New York’s 19th Congressional District, which covers much of the Hudson River Valley.
Maryland primaries
Senate: Benjamin L. Cardin is up for re-election.
Chelsea Manning, a former Army private convicted of disclosing classified information, has filed to run in the Democratic primary against Mr. Cardin, who won handily in 2012.
Utah primaries
Senate: The Senate race is open. (Senator Orrin G. Hatch is not seeking re-election.)
House: 1 out of 4 races is competitive in the general election.
Mitt Romney, a former Republican presidential candidate and a critic of Mr. Trump, is expected to cruise to victory in the primary and general elections.
Colorado primaries
House: 1 out of 7 races is competitive in the general election.
Oklahoma primaries
Mississippi primaries runoff
South Carolina primaries runoff
June 30
Texas special House election
Texas is holding a special election in the 27th District to fill the former seat of Blake Farenthold, a Republican who resigned after using taxpayer funds to settle a sexual harassment case with his former communications director. A crowded field of nine candidates means that a September runoff is likely.
https://www.nytimes.com/interactive/...y-results.html