Washington, DC [US], July 11 (ANI): Democratic leaders challenged United States President Joe Biden to provide convincing evidence of a viable path to reelection after his debate performance, bad battleground state polling and growing concerns that he cannot defeat former US President Donald Trump in the presidential elections, Washington Post reported. Democratic leaders are questioning President Joe Biden’s ability to win reelection after a disappointing debate performance and poor poll numbers in key states. They are calling on Biden to show a clear path to victory against his likely oppone…