ANALYSIS-Biden seen as weak front-runner as 2020 U.S. Democratic race heats up

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As summer ends and the race for the 2020 Democratic U.S. presidential nomination shifts into a higher gear, former Vice President Joe Biden's perilous position atop the vast field stands to be tested under even more pressure. Biden, 76, has consistently maintained a comfortable lead over his rivals. Labor Day serves as the traditional marker for the White House race to intensify, with five months to go until the first nominating contest - February in Iowa - in the state-by-state process of picking the party's nominee to challenge Republican President Donald Trump in the November 2020 election.