Realclearpolitics had shown a bump for Trump after the first debate. Now the front page says that he is back down to the pre-debate 7.4 spread. If you click the link though, there is no new polling data and the spread is 6.7 which reflects polling after the first debate. It will be interesting to see the polling from after the second debate.
Polling is meaningless. The polls are just Dem propaganda that are used to favor one candidate over another in the primaries. Allegedly, they can all beat Trump.