Iowans oppose raising the state's gasoline tax by nearly a 2-to-1 margin, according to The Des Moines Register's Iowa Poll. The survey asked about a pending legislative proposal to seek a 10-cent-per-gallon increase in the state's motor fuel tax to repair Iowa's system of roads and bridges, The Des Moines Register reported.Sixty-three percent of poll respondents were opposed, 35 percent were in favor and 2 percent were not sure. Other proposals to raise the tax have languished in recent sessions of the Legislature amid a lack of support. In February 2012, an Iowa Poll showed that 68 percent of Iowans were against such an increase, as compared with 70 percent in February 2011.