Former Georgia Lt. Gov. Geoff Duncan (R) said Monday that he will vote for President Joe Biden this year because Donald Trump has “disqualified himself.” In a Monday op-ed for The Atlanta Journal-Constitution, Duncan explained why he was splitting with his party for the presidential vote. “[T]he GOP will never rebuild until we move on from the Trump era, leaving conservative (but not angry) Republicans like me no choice but to pull the lever for Biden,” he wrote. “The alternative is another term of Trump, a man who has disqualified himself through his conduct and his character.” Duncan pointed…