Without a data operation in place right now (that means it is too late to build a successful one in time for the election), Trump is going to BOMB in swing counties because his campaign isn't going to be able to optimize support/turnout constituencies. Clinton, on the other hand, is going to have a data operation arguably more sophisticated than either of Obama's campaigns.
But the electoral college is of course WTA by state, not WTA by county. So while there are certain counties in swing states that Clinton will put extra focus on because of analytics, are those necessarily going to match up with the counties that are close to being 50/50 (“swing counties”), as opposed to counties in swing *states* where the county winner is already known, but you’re driving up the margin (or driving up turnout)?
