I don't understand this at all. There's no direct bribing because of the ramifications, but there is a lot of post-office job offer and campaign contribution gamesmanship, as everyone recognizes. However, I'm not sure where you're drawing your data from. Could you enlighten me? My anecdotal perception is that the "required" donations operate largely the same between parties. As per data compiled by the reputable OpenSecrets, of the top contributing organizations from 1989-2010, most of them donate strongly to Democratic candidates (this I assume would be the amounts used to "bribe" politicians).[1] Regardless of this fact, I still don't see an analogy between a flip-flop vote (I don't know the vote numbers, so that phrasing might not be true) on TARP by the Republicans (while I don't know numbers, as I recall, the Democrats also voted heavily against a "bailout" package before voting for it) and the way that AT&T might use political clout to push through this merger.
EDIT: Interesting to note, however, that AT&T is third on the list of all time donors and on the fence for Dem/Rep support. If the justice department wasn't full of appointments or hires as opposed to elected officials, this could strongly weaken the likely outcome of this suit. In any case, will be interesting to note the effect in upcoming elections that this has on AT&T's donation patterns.
[1] http://www.opensecrets.org/orgs/list.php
EDIT: Interesting to note, however, that AT&T is third on the list of all time donors and on the fence for Dem/Rep support. If the justice department wasn't full of appointments or hires as opposed to elected officials, this could strongly weaken the likely outcome of this suit. In any case, will be interesting to note the effect in upcoming elections that this has on AT&T's donation patterns.