He might be the oldest president in US history - but Joe Biden was once one of its youngest senators, when he began his political career more than half a century ago. <br /><br />His was a politics deeply rooted in blue-collar America - and shaped by personal tragedy. <br /><br />Time and again he overcame setbacks which would have defeated a lesser man - and as for his legacy, that has yet to be written.<br /><br />#news
