Why? There is no partisan divide over broadcast related issues, they are both totally beholden to corporate interests in that area. If for no other reason than they know they will get no pressure from constituents for doing what the broadcast industry wants. There aren't a million people all over the country calling their congressman telling them "if you don't renew DNS I'll vote for the other guy". Stuff like that or Locast is not even on voter's radar, so it is easy for them to just do what the lobbyists pay them to do.
Besides, the senate can amend the bills that come from the house and then it is resolved in a conference committee - which will have senior people who are most likely to have been accepting money from NAB lobbyists for years.
There has been a clear difference in positions held by GOP-appointed vs. Dem-appointed members of the FCC in recent years. And the parties seem to be moving further apart in terms of general governing philosophy/branding. I'm not completely discounting what you're saying but I don't believe that it makes zero difference on this issue which party controls the House (or the Senate).