Sen. Joe Manchin is considering challenging Vice President Kamala Harris for the Democratic presidential ticket, according to a report Sunday. Manchin — a longtime moderate West Virginia Democrat who turned independent this year — is weighing whether to return to the Democratic Party and make a run for the White House, sources close to his office told CNN.The 76-year-old called for Biden to drop out of the race Sunday morning just hours before Biden, 81, announced his withdrawal.What to know about President Biden's decision to drop out of the 2024 presidential race:President Biden announced Sunday he is dropping out of...