U.S. Rep. Alexandria Ocasio-Cortez, one of the most-powerful voices in the House Democratic caucus, re-asserted her support for President Joe Biden and Vice President Kamala Harris as some congressional Democrats along with pundits, pollsters, and strategists have called on the President to quit his campaign. The 34-year-old progressive New York Democrat in a nearly hour-long live video recorded after midnight declared her opposition to those proposing an “open convention,” where the Democratic nominee fro president would be decided, despite the 2024 primaries which Biden and Harris won. She b…