Sure, and somebody selling cars or tires or beer or UPS will buy them, of course.
Apparently Filth is placing nation-wide buys while Romney is doing only the targeted local buys.
0's marketing people aren't dumb, so I'd be surprised if they're doing a lot of national slots. It's just too expensive and he isn't really a "national" candidate. There are vast expanses of territory in the West and South 0 isn't going to carry. You may be getting bleed over because he's trying to hit some Latinos in NM and nearby states.
But he is indeed running ads nationally - heavily - and has been for quite some time - and not just on cable. Obama ran ads nationally on NBC during the Olympics, as did the RNC.
It’s good that Romney is apparently spending the money in the local markets on the cable systems based on other people reporting in...still frustrating to not see any responses to the blanketing of Obama ads being run nationally for those of us in the non battleground states. A possible reason would be to affect the overall national poll numbers to encourage your own base and demoralize the other side - not necessarily a waste of money.
Another reason would be satellite services - which I don’t think have “targeted” ad spots - another reason to advertise nationally on cable networks.