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From Power Line:

Republican whip Roy Blunt put together this chart showing the practical effects of Democratic vs. Republican policies on the price of gasoline at the pump; click to enlarge:

Blunt's office adds this footnote:

Methodology: Retail gasoline prices are the result of literally hundreds of factors including crude oil supply, global demand, refinery capacity, regulation, taxes, weather, the value of the dollar, etc. Therefore it is impossible to say with certainty what one individual action will do to the overall price. However, based on what we know about the impact of crude oil supply and prices it is possible to develop some potential ranges of impact on gasoline prices for certain policy changes. For example, using the methodology employed by Speaker Pelosi and House Democrats that suspending shipments into the Strategic Petroleum Reserve (between 40-77,000 barrels of oil a day) would reduce gas prices by at least 5 cents, bringing ANWR online (at least one million barrels of oil a day) could impact gasoline prices by between 70 cents and $1.60.