Jim Carroll, here's a site that tracks polls in the U.S. and allows you to view trends.

project five thirty eight

I don't think it includes a CNN poll that came out this morning that has Biden up by 14 points nationally. His anti-constitutional publicity stunt in Lafayette Square last Monday seems to have done considerable damage in most quarters. It's mobilized a number of well-respected former and current military higher ups against him, Colin Powell called him a liar, hardly news, yesterday on national TV and expressed support for Biden.
It's almost 5 months until the election but it's a good bet he'll become more crazy and desperate in the interim.