Understanding Impeachment

Impeachment is a political trial.  No one needs be impeached for violation of a law or statute on the books.  No one needs to be impeached while they are in office.  I think it is unwise for Dennis Kucinich to push, further, with impeachment proceedings, simply because we already know the effort will fail.  I believe Cheney and Bush should be impeached, and I thought so since the very start of the Iraq War.  But I don't get a vote in impeachment proceedings.  Counting the votes shows that Kucinich will lose.