Joe Biden has been slammed as the “singular reason” Kamala Harris lost the US election, with the Democrats turning on the gaffe-filled President. The devastating election defeat has led to immediate finger-pointing within the Democratic Party, with Biden, 81, becoming the primary target of criticism. “We ran the best campaign we could, considering Joe Biden was president,” a Harris aide told Politico in a stark assessment of the situation. The blame game has intensified as party members grapple with their seismic loss, with many suggesting Harris wasn’t given adequate time to win over voters d…