A Super PAC pushing for enactment of a controversial education tax credit to benefit private and parochial schools is targeting Bronx Democratic state Sen. Gustavo Rivera and three Assembly Democratic incumbents in the upcoming Sept.13 primaries.. The PAC, New Yorkers for Independent Action, has already spent nearly $256,000 of the $2.78 million on polling and campaign literature in the districts currently represented by Rivera and Assembly members Phil Ramos (D-Suffolk County), Pamela Harris (D-Brooklyn), and Latrice Walker (D-Brooklyn). It is supporting Councilman Fernando Cabrera against Rivera, Giovanni Mata against Ramos, Kate Cucco against Harris, and City Councilwoman Darlene Mealey against Walker. Tom Carroll started the Brighter Choice charter chain in Albany with the goal of replacing all public schools.,but aeveral of his schools closed because of academic deficiencies.