Former President Barack Obama made the case for Vice president Kamala Harris during the 2024 Democratic nominee’s Las Vegas rally Saturday night, by revealing that his successor — Donald Trump — ignored the pandemic playbook Obama’s administration developed for him. “When I was president, I had been talking to scientists for a while so during my last year in office, and we put together a pandemic playbook for how to deal with the eventuality of a pandemic,” the 44th president of the United States began. “Because scientists had been saying, with globalization and travel, etc. — rising populatio…