With voters heading to the polls in less than 50 days, one columnist is arguing that former President Donald Trump is now resorting to throwing policy ideas at the wall and seeing what sticks. In his latest op-ed, MSNBC producer Steve Benen wrote that Trump’s latest tax policy proposals amount to little more than “desperate grunts” in his effort to halt Vice President Kamala Harris’ surging momentum. He compared the ex-president’s 2024 policy pitches to his unsuccessful efforts to sway the 2018 midterms in Republicans’ favor by making vague promises to cut taxes — which caught GOP lawmakers un…