The Bushes are really reminiscent of the Habsburgs - another family of aristocrats whose primary loyalty was (is) to themselves and who were happy to take on the coloring of any group of people they could rule. Thus you had a Habsburg popping up in Mexico in the 19th century, Emperor Karl trying to make himself king of Hungary after WWI and another nephew who tried to enlist Ukrainian nationalism in support of his cause. Now of course Habsburgs are big supporters of the EU and continuously trying to find a role at the supranational level. In similar fashion a Bush can be an old New Englander (Prescott), a Texan (Dubya), or a Hispanic. Doesn't really matter to the Bush family. In some ways you have to admire the Bush clan for somehow managing to preserve an almost medieval sense of European aristocratic entitlement into the 21st century. 

"30 Rock," like "Curb Your Enthusiasm." reflects a cynicism that has developed among smart urban liberals. They recognize that a lot of liberal tropes have failed, but for cultural and tribal reasons they won't abandon the ship. Liberal cynicism is probably good for the Democrats - it allows them to have a bigger tent since for the most part they are OK with being mocked from the inside as long as certain lines aren't crossed. I don't see that on the GOP where there is a constant battle to be "more true conservative than Thou!". The Dems are applying the Putin strategy to power and the GOP the North Korea strategy.