Polling is only a snapshot in time. But with that caveat out of the way, things appear a touch rosier for President Joe Biden after months and months of polling that showed former President Donald Trump would sail to reelection if the rematch were held today. The November contest will again be decided by at least a half-dozen swing states. And new polling from Bloomberg Tuesday showed Biden gaining ground in seven of them. Compared to last month, Biden made incremental gains in Wisconsin, Pennsylvania, Michigan, Nevada, Georgia, Arizona and North Carolina. To be fair to Trump, the Bloomberg po…