Democrats kept the Senate this year, but 2024 may be harder


              FILE - Sen. Kyrsten Sinema, D-Ariz., speaks during a Senate Homeland Security and Governmental Affairs committee hearing to examine social media's impact on homeland security, Sept. 14, 2022, on Capitol Hill in Washington. In 2024 Sinema will be up for reelection. (AP Photo/Alex Brandon, File)
            
              FILE - Sen. Jacky Rosen, D-Nev., speaks during a Senate Homeland Security and Governmental Affairs Committee hearing to discuss security threats 20 years after the 9/11 terrorist attacks, Sept. 21, 2021 on Capitol Hill in Washington. Rosen will up for reelection in 2024. (Greg Nash/Pool via AP, File)
            FILE - Sen. Rick Scott, R-Fla., walks outside a meeting on Senate Republican leadership elections on Capitol Hill in Washington, Nov. 16, 2022. A number of high-profile Republican senators will also be up for reelection in 2024, including Ted Cruz of Texas, Josh Hawley of Missouri and Rick Scott of Florida. (AP Photo/Patrick Semansky, File) FILE - Rep. Alex Mooney, R-WVa., attends a campaign rally at the Westmoreland Fair Grounds in Greensburg, Pa., May 6, 2022. In 2024 Sen. Joe Manchin, D-W.Va., will be up for reelection. Manchin has already drawn a GOP challenger in Mooney, who declared a week after winning reelection that he was setting his sights on higher office. Manchin has not yet said whether he'll run for reelection. (AP Photo/Gene J. Puskar, File) FILE - Sen. Ted Cruz, R-Texas, speaks at an annual leadership meeting of the Republican Jewish Coalition, Nov. 19, 2022, in Las Vegas. A number of high-profile Republican senators will also be up for reelection in 2024, including Ted Cruz of Texas, Josh Hawley of Missouri and Rick Scott of Florida. (AP Photo/John Locher, File) FILE - Senate Majority Leader Chuck Schumer, D-N.Y., center, welcomes Senator-elect Peter Welch, D-Vt., left, and Senator-elect John Fetterman, D-Pa., whose victories helped give Democrats the majority in the next Congress, at the Capitol in Washington, Tuesday, Nov. 15, 2022. (AP Photo/J. Scott Applewhite, File) FILE - Nevada Republican U.S. Senate candidate Sam Brown speaks to media after voting at Reno High School in Reno, Nev., Tuesday, June 14, 2022. In Nevada, the Republican field to challenge Sen. Jacky Rosen, D-Nev., has not begun to shape up but is expected to attract several contenders. One name receiving attention is Sam Brown, a former U.S. Army captain who was awarded a Purple Heart after being severely wounded in Afghanistan. Brown ran for Senate this year and put up a strong challenge in the Republican primary before losing to Adam Laxalt, who lost in the general election to Cortez Masto. (AP Photo/Tom R. Smedes, File) FILE - Sen. Jon Tester, D-Mont., speaks at a news conference alongside Sen. Richard Blumenthal, D-Conn., back left, and Sen. Kirsten Gillibrand, D-N.Y., after the Senate passed a bill designed to help millions of veterans exposed to toxic substances during their military service, Aug. 2, 2022, on Capitol Hill in Washington. (AP Photo/Patrick Semansky, File) FILE - Rep. Ruben Gallego, D-Ariz., speaks during a House Armed Services Committee hearing on July 9, 2020, on Capitol Hill in Washington. In 2024 Sen. Kyrsten Sinema, D-Ariz., will be up for reelection. Sinema's most prominent potential primary challenger is Gallego, who has a long history of feuding with Sinema. Gallego has not announced his plans for 2024 but has made it no secret that he's thinking about challenging Sinema. He even raised money on the prospect he might oppose Sinema. (Greg Nash/Pool via AP, File) FILE - Senate Majority Leader Chuck Schumer, D-N.Y., speaks to reporters at the Capitol in Washington, Nov. 15, 2022. Democrats celebrating a successful effort to keep control of the U.S. Senate this year will soon confront a 2024 campaign that could prove more challenging. (AP Photo/J. Scott Applewhite, File) FILE - Sen. Bob Casey, D-Pa., speaks before President Joe Biden at a campaign rally for Pennsylvania's Democratic gubernatorial candidate Josh Shapiro and Democratic Senate candidate Lt. Gov. John Fetterman, Nov. 5, 2022, in Philadelphia. Casey has not said whether he intends to run for a fourth term. Casey easily won reelection in 2018, but Pennsylvania has been competitive for Republicans, including in this year's Senate race won by Democrat John Fetterman. (AP Photo/Matt Rourke, File) FILE - Sen. Joe Manchin, D-W.Va., speaks during a news conference on Sept. 20, 2022, at the Capitol in Washington. In 2024 Manchin will be up for reelection. (AP Photo/Mariam Zuhaib, File)