Conservative pundit David Frum wished Donald Trump’s campaign the best of luck in keeping him quiet the rest of the way. The 2024 campaign has been turned upside down by the ascendance of Kamala Harris as the likely Democratic nominee, and the former president has been lashing out with bizarre statements as his campaign struggles to slow the vice president’s momentum, which Frum said would turn even more voters against him. “Mike Murphy, the Republican campaign consultant a decade ago or nearly a decade ago said that asking Donald Trump to talk about policy, it’s like teaching Charles Manson t…