Bloomberg says in the ad that the nation needs to support Democrats to "send a signal to Republicans in Washington that they have failed to lead, failed to find solutions, and failed to bring us together."

In Pennsylvania, a hoarse former Vice President Joe Biden accused the Trump administration of shredding the nation's "moral fabric" and a GOP-controlled Congress of waging a broad war on middle-class protections, from health care to Social Security.

Democrats, he said, must take back the country to reset the nation's moral compass.

"This is the United States of America," Biden said. "We can take it back." Biden, campaigning in a tight congressional race in conservative central Pennsylvania, urged people to vote — "Don't boo, vote!" he told the crowd, quoting Obama — and said, "We are in a battle for America's soul."

Biden spoke to a crowd of more than 500 people at the Pennsylvania Farm Show Complex in Harrisburg to boost George Scott, a Democratic candidate for Congress challenging three-term Republican Rep. Scott Perry.