Joe Biden railed against “trillionaires” in a speech Friday where he also vowed that middle-class Americans wouldn’t pay a penny more in taxes under his plan — despite wanting to eliminate President Trump’s tax cuts for the middle class. During a 25-minute stump speech in Des Moines, Iowa, the Democratic nominee repeated his campaign pledge that Americans earning less than $400,000 a year would not see their taxes raised if he was elected president next week. “I guarantee you, I give you my word as a Biden, no one making less than $400,000 a year will see a penny in...