US Secretary of Education Betsy DeVos speaks as Vice President Mike Pence listens during a White House Coronavirus Task Force press briefing on July 8, 2020. Alex Wong/Getty Images Betsy DeVos on Saturday took aim at singular figures wielding vast power in politics. The former Education secretary spoke at the Mackinac Republican Leadership Conference in Michigan. DeVos, a Michigan native, did not specifically mention Trump in her comments to the GOP faithful. See more stories on Insider’s business page. Former US Secretary of Education Betsy DeVos on Saturday gave implicit criticism of former President Donald Trump’s hold over the GOP, expressing concern that “principles have been overtaken by personalities” in…