Friday, February 26, 2010 Market Commentary: Stocks closed with modest gains on Friday which marked the 15th day of the current rally attempt. Volume, a critical gauge of institutional demand, was mixed compared to Thursday’s levels; higher on the Nasdaq exchange and lower on the NYSE. Advancers led decliners by a 12-to-17 ratio on the NYSE but trailed by 13-to-14 rato on…