Doesn't seem to me like the Republican party are doing a particularly good job of placing limits (or enforcing existing ones) on government power. It has only been a few years since they supplied a president, and as I recall he took more power into his own hands (or rather that of his office) than had been customary before. He said "I'm the decider", as I'm sure you know. I think that speaks volumes about his goals.
I certainly won't make the argument that the Obama administration is better than what had gone before. I merely point out that both parties are pursuing the goal of taking power for the government. To whom do you turn? It seems unlikely that a third party candidate will win the presidential elections.
This distinction will soon become meaningless since copyright terms will always be extended if Disney or some other sufficiently large and "important" studio / publisher request it. I wouldn't be surprised to see patent terms extended too, one day. Probably Apple or Microsoft will request it.
Of course by "important" I mean that they contribute money to the right people.