President Biden on Friday gave his first major general election speech — one that delivered a furious attack on his likely GOP opponent, former President Trump, and a stark warning that Trump’s reelection would post a threat to American democracy. Biden, speaking near Valley Forge, Pa., a significant symbol of the American Revolution, zeroed in on the Jan. 6, 2021, attack on the Capitol to drive home his argument that Trump and his Republican supporters have embraced the kind of extremism that was on display that day three years ago. “Democracy is on the ballot. Your freedom is on the...