In re: Gerrymandering. Your vote doesn't really count for much. Never did. Read on.
"One important reason is that once every decade, after each census, politicians in most states get to redraw congressional and legislative districts. They usually take the opportunity to advance the interests of one party or the other or both. Such gerrymandering often yields weirdly shaped districts designed to assure that whoever is in office stays in office.
It works. In the U.S. House of Representatives, over the past five elections, incumbents have been re-elected at an average rate of 96 percent. According to my unscientific calculations, a congressman is more likely to be eaten by a polar bear while panning for gold in Key West than to be voted out of office."