In an action that had been anticipated for several weeks, the American Beverage Association, joined by several Philadelphia residents, filed suit against the city of Philadelphia challenging the legality of the recently enacted soda tax.  The suit contends that imposition of the new tax, 1.5 cents per ounce, is preempted by the state sales tax and further that it would violate state and federal laws by taxing items purchased through the Supplemental Nutrition Assistance Program (SNAP, also known as food stamps).  The tax, which was championed by Philly Mayor Jim Kenney, will cost consumers an additional $2.16 per twelve pack of soda. By comparison, the state excise tax on a twelve pack of beer is only 9 cents.  City officials contend the tax will generate $91 million per year.