CHICAGO — A refreshed Democratic Party is gathering for a valedictory speech from President Joe Biden, whose decision to end his reelection bid released newfound energy with Vice President Kamala Harris′ rise to the top of the ticket. The Democratic National Convention that began Monday in Chicago holds particularly high stakes for the party. If successful, Democrats will slingshot Harris toward an faceoff with Republican Donald Trump, whose comeback bid for the White House is viewed by Democrats as an existential threat. But a false step could hobble Harris at a moment when her candidacy has been enjoying a burst of money, momentum and even joy. – Associated Press