I would though, support a higher gas tax, if it was offset or at least partially offset with the bottom three income tax brackets having a substantial rate decrease. This should actually be acceptable to most everyone. Those on the far right should like it because it would still increase taxes on the 47% that they despise so much and refer to as "tax slackers", it should appease the tree hugers (who coincidentially also happen to mostly be on the far left) for obvious reasons, and it should be appealing to the solidly middle class and upper middle class.
Politicallly, it would seem to be a win-win-win proposition, but nearly everyone has this kneedjerk reaction to it. I think it's mostly because the price of gas is in our face every day. No product is more price competitive than gas, which is evidenced by the fact that every gas station has a huge $100,000 sign advertising gas prices.