So why didn’t they do a national poll instead of a battleground poll? In past elections all we saw post Convention were national polls.
I’m guessing the bump was a bit more than they could handle.
Reading the tea leaves watching Manafort’s interview with Chris Wallace, the bump was small. He said he thinks they are ahead, and went on to say that they are not paying attention to national polls, but rather the expanded battleground states. While a correct statement, it seems to indicate that whatever polling the campaign may have seen, the convention bump was not huge.