The Constitution's Impeachment Clause applies to all "civil officers of the United States" - not to mention the president, vice president and federal judges. It is not clear who, precisely, is among those considered "civil officers," but the group certainly includes a president's cabinet and sub-cabinet, as well as the senior department officials and the White House staff (those who are issued commissions by the president and serve the President and Vice President).
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Lowering the aim of an impeachment effort to focus on those who have aided and abetted, or directly engaged in, the commission of high crimes and misdemeanors, would have all the positives, and none of the negatives, of going after Bush and Cheney. It would not be an effort to overturn the 2004 election, but rather to rid the government of those who have participated, along with Bush and Cheney, in abuses and misuses of power; indeed, many among them have actually encouraged Bush and Cheney to undertake the offensive activities.

Many of these men (and a few women) are young enough that it is very likely that they will return to other posts in future Republican Administrations, and based on their experience in the Bush/Cheney Administration, they can be expected to make the offensive conduct of this presidency the baseline for the next president they serve. Impeachment, however, would prevent that from happening.

Lam, meanwhile, was replaced by the executive assistant U.S. attorney in her district, Karen Hewitt. According to a February 26 New York Times column by assistant editorial page editor Adam Cohen, Hewitt's résumé "shows almost no criminal law experience, but includes her membership in the Federalist Society, a conservative legal group."

in the absence of the commission of a criminal act, i don't see where congress has the authority to impeach a cabinet officer.

By the time George W. Bush leaves office, he and has advisers (Dick Cheney) will have pushed us into a nightmare from which there will be no escape, and that's been their plan all along.  By 2009, when and if the president leaves office, they will have put us on a course from which there is no turning aside.

Simply put the members of the Bush White House and George W. Bush are traitors to the Republic.  They chose to mislead our country and the world in order to reshape the globe according to their corrupt perverse vision. Until there is a trial for treason, where these war criminals are made to answer for their crimes, the United States of America can no longer claim to be a Democratic Republic, for it has been subverted by a renegade president and White House who have forced us all to join them on this ship of fools.

If the people of the United States let this stand, this is the beginning of the end for democracy in America.

Arrest George W. Bush and all the complicit officers of this White House today.  Put them behind bars where they can do no further harm, save the republic before it's too late.