evidence: After endorsing Kamala Harris on X Sunday, former Republican Sen. Jeff Flake of Arizona praised the vice president's grasp of foreign policy and her proposal for tougher border restrictions on ABC News' "This Week." [...] Flake also endorsed Biden in 2020 on the first day of the Republican National Convention along with dozens of former GOP members of Congress. [...] Raddatz pressed Flake on whether his endorsement would make inroads with voters in Arizona who are a part of the Church of Jesus Christ of Latter Day Saints, of which he is a member. Sen. Mitt Romney, R-Utah., another high-profile Mormon Republican opposed to Trump, has not endorsed Harris.