WASHINGTON — Rep. Alexandria Ocasio-Cortez (D-NY) says congressional Democrats’ public complaints about President Joe Biden’s age have become a bigger problem for the party than the age itself. “I think that the way that our party conducts itself in public contributes just as much to our political challenges as any facts on the ground,” Ocasio-Cortez told Raw Story on her way to vote at the Capitol Thursday. “And so, to me, that is something that I encourage my colleagues to think about, because these things don’t happen out of thin air.” Instead, Ocasio-Cortez said, the party needs to focus o…