I am not a crook.Some 46 years ago, President Richard Nixon made that infamous declaration during a press conference in Orlando, Florida. While the quote is not exactly another "ask not what your country can do for you," his five words, perhaps more than anything else, came to define an era of American history. Today they are printed in countless history books as a study in irony, corruption, and holding our leaders accountable.Now, nearly half a century on, the murmurs of impeachment have started once again. And although no one can know the future, we very well may be listening to the words -- or reading the tweets -- that will write the chapters of our future history books. Here are seven quotes from the past week alone that students could be reciting in classrooms half a century from now.1\. "In the course of my official duties, I have received information from multiple U.S. government officials that the president of the United States is using the power of his office ...