Three years after he led the charge to require consumers to ditch their comfortable old incandescent lights in favor of those twisty CFL bulbs, Rep. Fred Upton now wants to be the man to help undo that law as the next chairman of the House Energy and Commerce Committee. That about-face is not unique among lawmakers looking to atone for stances they've taken over the past decade as they seek to gain top posts in a decidedly more conservative Republican Congress, but his reversal underscores how intent the GOP is on proving it has broken with past practices. "We have...