Democrats need to go big or go home on impeachment
Editor's note: Julian Zelizer, a CNN political analyst, is a professor of history and public affairs at Princeton University, and author of the forthcoming book, "Burning Down the House: Newt Gingrich, the Fall of a Speaker, and the Rise of the New Republican Party." The views expressed in this commentary belong to the author. View more opinion at CNN.
(CNN) -- It's time for the House Democrats to make a decision about impeachment.
Congress returns from summer recess this coming ...