- It won't save people a lot of money, and it's bad because the government will lose revenue.
- It encourages oil consumption, which is the opposite of what we need to do long-term.
- Wait - it won't actually lower the price of gas anyway. It just means the oil companies will get more profits and the government will keep less. (Some might view this as a feature rather than a bug, but few Democrats would.)
Of course, many people get to the point of realizing merely that the oil companies will raise the price to compensate. If they can charge $3.50 (or whatever) now, including the tax, there's no reason they wouldn't continue to charge that in the future. Oh, those greedy oil companies - is there no level to which they won't stoop?
As far as I know, the oil companies (at least in America) are not a cartel. They do not actually control the price of gasoline. It's a free market, which means that the price is (more or less) a function of supply and demand.
Please note that I'm not saying they wouldn't control the price if they could. I'm not saying the oil companies are virtuous and trying to get us a fair deal. They want to make as much money as possible, just like we want to save it. But they no more control the price of oil than realtors control the price of houses, or than Kroger controls the price of oranges.
Ahem. I really didn't mean to lecture on points familiar to everyone. So, let me return to my earlier point - it is great to see some public debate on a simple economic issue. And this one is apparently so simple that Clinton's campaign couldn't come up with a single economist to support the gas tax holiday. People thinking their way through economic issues, even though it has mixed results, is a good thing.