These charts reflect the results of a new Quinnipiac University Poll. They questioned 978 registered voters in Pennsylvania (including 431 registered Democrats). The margin of error for all voters was 4.2 points, and for Democrats was 6.2 points.
The Democrats overwhelmingly believe that Joe Biden has the best chance to beat Donald Trump. That's the opinion of 61% of them. Bernie Sanders was in second place -- but far behind at only 6%.
Biden also has the most current support in Pennsylvania. About 39% of Democrats say they would vote for him. Others getting significant support were Sanders (13%), Harris (8%), Warren (8%), Buttigieg (6%), and Booker (5%).
The chart below was done of all voters. It shows that Biden would easily defeat Trump by double-digits (11 points) if the election was right now (53% to 42%). Sanders would win by 7 points, and Warren by 3 points.