BUILDING THAT WALL:

Internal Democratic polling conducted in August and September revealed the party's candidate leading or trailing by small margins in a dozen seats on the outer edges of the battlefield. And outside money is already starting to flow beyond the 50 or so districts that initially drew major TV ad reservations.

The GOP's top House super PAC, the Congressional Leadership Fund, funneled nearly $3 million into a few sleeper races that had previously received little national attention. And the Democratic Congressional Campaign Committee booked more than $100,000 of airtime in Republican Rep. Mike Kelly's northwestern Pennsylvania district, which President Trump carried by 20 points.

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