Democrats at the highest levels are making a push for President Joe Biden to reevaluate his election bid. Former President Barack Obama, under whom Biden served as Vice President, has reportedly privately expressed concerns to allies that Biden needs to consider the viability of his campaign but has also made clear that the decision is one Biden himself needs to make. Obama has taken calls in recent days from members of congressional leadership, Democratic governors and key donors to discuss their concerns about Biden’s health. Speaker Emerita Nancy Pelosi has also privately told Biden the par…