Associated Press
A motorist gets gas at a Hot Spot convenience store on East Main St. where the price is $2.99 a gallon, Friday, June 1, 2012 in Spartanburg, S.C. Oil prices plunged Friday as bleak reports on U.S. job growth and manufacturing heightened worries about a slowing global economy.

In February, Republicans were confident that gasoline prices would be a winning political issue in the fall. Commentators allied with the GOP predicted $5-a-gallon gas by Memorial Day and $6 per gallon by Election Day.

And they blamed the high prices on President Barack Obama, saying it was a deliberate policy to drive Americans into using alternate forms of energy. They also cited his alleged failure to green-light energy projects like the Keystone XL pipeline.

House Speaker John Boehner said, "This debate is a debate we want to have. Certainly this summer will see the highest gas prices in years."

As they've proved in the past, gasoline prices are a thoroughly unreliable political issue. They peaked in early April and have since fallen more than 50 cents to what the AAA said was a national average of $3.40 a gallon this past week.

Indeed, falling gas prices are credited with holding down the consumer price index, the government's basic measure of inflation. Consumer prices actually fell during the second quarter.

Each time the politicians seize on gas prices as a campaign issue, oil-industry experts patiently explain that prices are affected by a complex mix of factors — global demand, weather, refining capacity, civil unrest, underinvestment by state-owned oil monopolies and, most recently, Iran's veiled threats to shut off the Strait of Hormuz.

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And, these experts point out, for all the "drill, baby, drill" cheerleading, new energy projects can take years, even decades, to come online and begin affecting prices.

As good conservatives, Republicans are surely aware of economist Julian Simon's famous bet with an ecological doomsayer that, over 10 years, rather than run out of certain commodities, rising prices would instead increase the world's supply. Simon won the bet.

As always, when gas prices reach a level Americans feel they can live with, they lose interest in the issue and so do the politicians.