Political parties

In this Aug. 2, 2018, photo, President Donald Trump, right, greets Senate candidate Rep. Lou Barletta, R-Pa., during a rally in Wilkes-Barre, Pa. More than 2,600 candidates are running in the midterm elections. But for the president, the election comes down to one person: Donald Trump. With the primary calendar winding down, Trump’s me-first strategy is prompting a wave of concern within his own party. (AP Photo/Matt Rourke)

FILE - This combination of file photos shows Kansas Democratic gubernatorial candidates who will square off in a debate Wednesday night, July 11, 2018, in Wichita, Kan. From left, are: Kansas state Sen. Laura Kelly, D-Topeka; former Wichita Mayor Carl Brewer; and former state Agriculture secretary Joshua Svaty. Kansas Democrats are riding an eight-year losing streak in statewide elections, and there’s pressure to break it. That pressure has intensified a debate within the party over how to pull more votes from Republican-leaning rural areas to help win the governor's race this year. (AP Photo/John Hanna, File)

Supporters wears masks depicting Brazil's former President Luiz Inacio Lula da Silva during the Workers Party national convention in Sao Paulo, Brazil, Saturday, Aug. 4, 2018. The convention confirmed the jailed Lula da Silva as their candidate for the country's presidency in October's election. Da Silva leads the polls by a large margins, but is likely to be barred by Brazil's electoral justice. (AP Photo/Nelson Antoine)

In this July 24, 2018, photo, U.S. House candidate Ed Case and his wife, Audrey Case, greet evening commuters while campaigning in Honolulu. The seat representing Honolulu in the U.S. Congress is open for anyone's taking, as incumbent U.S. Rep. Colleen Hanabusa runs for governor instead of re-election. (AP Photo/Audrey McAvoy)

FILE - In this July 16, 2018, file photo, Senate Minority Leader Chuck Schumer, D-N.Y., speaks to reporters on Capitol Hill in Washington. Schumer and Democratic Sen. Dianne Feinstein plan to begin meeting with Supreme Court nominee Brett Kavanaugh when senators start returning to Washington in mid-August. (AP Photo/J. Scott Applewhite, File)

Republican U.S. Rep. Marsha Blackburn campaigns Thursday, Aug. 2, 2018, at a cafe in Brentwood, Tenn. Blackburn is strongly embracing President Donald Trump as she claims the Republican nomination for Tennessee's open U.S. Senate seat. (AP Photo/Mark Humphrey)

Senate Judiciary Chairman Chuck Grassley, R-Iowa, joined from left by Sen. Orrin Hatch, R-Utah, Sen. John Cornyn, R-Texas, and Sen. Mike Lee, R-Utah, holds a news conference to refute Senate Democrats who are intensifying their fight over documents related to Supreme Court nominee Brett Kavanaugh's stint as staff secretary at the White House, on Capitol Hill in Washington, Thursday, Aug. 2, 2018. (AP Photo/J. Scott Applewhite)