Latest proposals in Arkansas, Louisiana, Oklahoma and Missouri to raise infrastructure funds .
Pennsylvania leads nation with highest combined federal, state taxes
10 tax increases have been defeated or postponed
States weigh tax increase against low gas prices, high budget shortfalls
Significant legislative headlines from the past month
Analysis finds additional revenue, minimal economic pain with tax increase
President's $10.25-per-barrel fee may be a strategy to "fork" the oil industry,.
Minimum packaging requirements only take effect if city is sued over OTP tax
Per-barrel fee would pay for "cleaner, more sustainable transportation system".