Republicans two seats short of U.S. Senate control are expected to spend tens of millions of dollars on ads attacking Montana Democratic Sen. Jon Tester as a Washington insider tainted by lobbyist cash. Ousting Tester would cement a Republican lock on a state that voted overwhelmingly for Donald Trump in 2020. Tester is a plain-spoken grain farmer with a flattop haircut and a carefully cultivated reputation as a moderate after 17 years in the Senate. Tester has survived three closely fought elections and a changed national political landscape to emerge as the lone Democrat in high office in Mo...