JACKSON, Miss. (AP) — Mississippi Democrats on Tuesday will decide between longtime U.S. Rep. Bennie Thompson and his 34-year-old primary challenger in a race that reflects generational struggle for control of the party. Thompson, a 78-year-old civil rights leader who chaired the House Jan. 6 Committee and serves as a ranking member on the House Homeland Security Committee, has held his seat for more than three decades. He is running against Evan Turnage, an antitrust lawyer who previously