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.
In its long history, the House has impeached 16 officials (with only seven convicted): 1  William Blount, senator from Tennessee; charges dismissed for want of jurisdiction, January 14, 1799.  John Pickering, judge of the U.S. District Court for New Hampshire; removed from office March 12, 1804.