I would say it highlights human nature. The pigs(the ones "more equal") started off with good intents. They helped make the place a better place. But then their greed and love of power, began to grow, until they became tyranical. So it can highlight the political system we see.
Also the "rewritting" the past(they rewrote their "rules" to make them better off, and have more power). I see that going on now.
A example is the seperation of church and state( It isnt even in the constitution, just something Thomas Jefferson, mentioned in a letter), is "rewritten" to say that religion cant have anything to do with the government.
In actuality that was meant so the actual CHURCH itself, cannot govern. (ex. The pope cant tell the president what to do) AND that the government cannot set up a "national religion".
Currently it is abused to the point, it INTERFERES with our RIGHT to worship. A sports team cannot say a prayer. A public school cannot have a prayer. If a public school is mostly Christian then a Christian prayer may be said. And if a member of a other religion wants to have a prayer, then they can request it. etc etc.
I got just a bit sidetracked. But those are just some similarities i can thing of off the top of my head.
Have a great night folks.