More than 200 Republicans who previously worked for former President George W. Bush, the late Sen. John McCain, R‑Ariz., or Sen. Mitt Romney, R‑Utah, penned an open letter Monday endorsing Vice President Kamala Harris for president.The cohort of Republican officials, which also includes a handful of aides to former President George H.W. Bush, previously sought to rally voters against former President Donald Trump in 2020. In their letter, the GOP officials singled out “moderate Republicans and conservative independents,” calling on them to vote for Harris.“Four years ago, President George W. Bush, the late Sen. John McCain, and then-Gov. Mitt Romney alumni came together to warn fellow Republicans that re-electing Presi …