Voters in some U.S. swing states are feeling the pinch of rising gasoline prices more than those in states that tend to vote Democrat, posing a challenge to President Barack Obama’s re-election, according to a report.

Gasoline in Florida, Michigan, Nevada and Pennsylvania costs more than the national average of $3.76 a gallon, Trevor Houser, a partner at the New York-based policy analysis firm Rhodium Group, said yesterday in a report. Consumers in Iowa, New Mexico and Ohio spend more on gasoline as a percentage of their personal income than the national average.