Gasoline prices are finally seeing their usual seasonal decline across most of the nation.

The average price for a gallon of gas fell 8 cents during the past week to $3.74. Drivers in some states are getting bigger breaks than others. In the Northeast prices fell from 2 cents to 7 cents. Meanwhile, in Ohio, a key battleground state in the presidential election, the price dropped 22 cents.

The nationwide average is still at a high for this time of year, and the price of gas was a topic in Tuesday's presidential debate between President Barack Obama and Mitt Romney. What follows is a chart showing the one-month drop in gas prices in the nine states that are expected to decide the election. Below that is a chart of how much prices in those states have risen this year.

Source: AAA, Oil Price Information Service and Wright Express.