Should charge PA sales tax? is fighting efforts by New York and other states to collect sales taxes for billions of dollars in online sales, reports Michael Mazerov of the Center for Budget and Policy Priorities here.

Amazon says keeping track of who owes what is unfair and burdensome -- yet Amazon already collects state taxes on purchases from sites for Target, Macy's and other clients that charge proper state taxes, according to Mazerov.

Should Amazon pay? It's an especially relevant question for Pennsylvania, which is one of five states where "Amazon has a physical presence (including a new Hazleton warehouse that's supposed to employ over 1,000 by next year) but nonetheless doesn't collect sales tax," Mazerov told me.