A former Obama administration official claimed former President Donald Trump showed “serious signs” of lacking the capacity to be President during a Monday MSNBC appearance following President Joe Biden’s decision to end his reelection bid. Biden said he would not accept the Democratic Party’s nomination for president in a Sunday afternoon post on X, then endorsed Vice President Kamala Harris for the Democratic nomination to replace him in the 2024 election against Trump in a follow-up post. David Plouffe, who served as a senior advisor to then-President Barack Obama, argued that Trump’s accep…