| http://www.w3.org/ns/prov#value | - However, presidents including Obama have refused to touch the suggestion with a 10-foot pole because it is considered political suicide to ask voters to accept higher fuel levies.Harvard University economist Greg Mankiw, currently an advisor to GOP presidential hopeful Mitt Romney, has long been an advocate of a $1-per-gallon gas-tax hike phased in over 10 years (Romney will not countenance the tax).
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