Editor's Note: This content was originally published on Benzinga.com by The ETF Professor Benzinga Staff Writer. For one trading day at least it looks as if the January Effect the scenario under which small-caps lead an early-year market rally is working. With a Wednesday gain of almost 3% on volume that was well above double the daily average the iShares Russell 2000 Index Fund (NYSEARCA:IWM) surged to a new-all time high. That should give fans of the January Effect something to brag about. When including Wednesday's gain the $15.9 billion ETF has jumped almost 6% in the past month. ...