An Iowa senator has been tapped to take the helm of a new Senate caucus that will work with Elon Musk and Vivek Ramaswamy's largely symbolic Department of Government Efficiency, which is tasked with identifying areas to slash spending. Sen. Joni Ernst will head the Senate DOGE Caucus after meeting with Ramaswamy at Donald Trump's Mar-a-Lago club, Politico reported. "The …