ALG is not just an internal pollster: it is the Democratic internal pollster. It's the go-to pollster for the usually secret internal polling used by DNC, DSCC campaigns and even presidential campaigns. Obama's internal swing state pollster in 2008 and 2012 was ALG; they're the ones who gave the campaign the level of confidence they had in the final days and weeks.
Given that the results of those elections would later prove the validity of the basis for Obama's confidence, shouldn't that mean ALG was pretty accurate in 2008 and 2012?