Political insiders and advisers in former President Obama’s orbit are increasingly joining Vice President Harris’ campaign as she prepares to face off against former President Trump in November. Harris has less than 100 days to inspire voters to rally behind her White House run after President Biden dropped out of the race in the wake of mounting concerns over his mental acuity and 81 years of age. The vice president officially clinched her party’s 2024 presidential nomination on Friday, earning more than a majority of votes from convention delegates, the DNC reported. After Biden’s departure from the race, Harris is in the midst of building out her campaign team, most notably adding a bevy of Obama …