You will hear people say that due to pollination, air pollution, or the intervention of the Alien Overlords (OK. I made that last one up. But people get a little extremist at times) there is no such thing as organic food any more.
Yes, any government official can be impeached - Presidents, Legislators & Judges, etc. But you can't impeach people for doing a bad job. Impeachment is necessarily dependent upon a charge of criminal or significant unethical behavior to warrant removal. Yes, Granholm is awful, but we're stuck with her for 4 more years.
Answer Wiki. The president remains in office even if they are impeached. Only upon conviction by the senate will they be removed, in which case the next eligible person in the line of succession will become president (this will normally be the vice president). Bill Clinton and Andrew Johnson are the only two presidents to be impeached and neither were convicted.