PHILADELPHIA (AP) — President Joe Biden delivered an unapologetically economic populist message Saturday during the first rally of his reelection campaign, telling an exuberant crowd of union members that his policies had created jobs and lifted the middle class. Now, he said, is the time for the wealthy to "pay their fair share" in taxes.

Biden spotlighted the sweeping climate, tax and health care package signed into law last year that cut the cost of prescription drugs and lowered insurance premiums — pocketbook issues that advisers say will be the centerpiece of his argument for a second te...