The Democratic Congressional Campaign Committee just dropped another $350K on a media buy in the 29th. That brings DCCC spending in the 29th to almost $900K.
The DCCC has not posted a new anti-Kuhl or pro-Massa ad, so it's not clear what ad that money is paying for.
With this buy, the DCCC spending has far outstripped their Republican counterpart. The NRCC has spent less that $400K in the race, and their last expenditure was on some direct mail last Friday. $9K of direct mail on Monday.
I'm no expert in media buys, but I assume the window for booking TV time before the election is almost closed.