President Joe Biden has begun three straight days of campaigning in Pennsylvania, in Scranton, his childhood hometown. The president used the working-class city of about 75,000 as a backdrop for his proposal to raise taxes on the wealthy on Tuesday. He also criticized his campaign rival, former President Donald Trump, as elitist. Biden’s trips overlap with the start of Trump’s first criminal trial in New York. The former Republican president faces charges over a scheme to suppress allegations of a sexual encounter with porn actress Stormy Daniels. Pennsylvania is a crucial battleground state that Biden has visited repeatedly in his bid for a second term.