>> it's not a crime or a misdemeanor under the constitution to make a mistake. >> after bush's mistake, the country was totally polarized in its view of the president, and the partisan gap was the widest ever recorded. >> the president of the united states. >> impeachment fever would only get worse under the next president. >> change has come to america. >> in 2008, barack obama was elected on a promise to help heal the country's extreme partisan divide. >> yes, we can. yes, we can. >> but the candidate who had campaigned on "yes, we can" ran into a wall of republican opposition. >> hell no, you can't! >> the tea party formed around an almost fanatical opposition to barack obama. in 2010, it propelled a wave of republicans to congress. >> what does it feel like?