Polls are meaningless, just feel good stuff.
If Republicans want to win, they have to assume they are behind.
Which they are, in a few other polls not being hyped here. It may seem incredible that Democrats could be up in any poll, even generic ones like these, but it's not possible to overestimate the stupidity of a large (Democrat) segment of the American population.
The lefties at Economist/YouGov (D+3)
The lefties at Politico (D+1)
Even the (formerly) beloved Rasmussen is D+1 at this time. Being 6 months out from election day the polls are all over the place, enabling everyone to believe whatever polls match their wishes and hopes. That will still be true, as it always is, 6 *days* out from election day.