Does it matter when sugar is already dirt cheap? In bulk it costs 18 cents per pound. Given that a person is unlikely to eat even half a pound of sugar per day, the price is unlikely to be a factor. Even if for some reason corn syrup is free, the budgetary hit is less than a dime per day. I doubt that's going to change anyone's eating habits.
Look it up. They are both dirt cheap. We just happen to subsidize one and artificially raise the price of the other.
Now, maybe caloric sweeteners should be much more expensive and maybe that will have a positive impact on society (like incentivize zero-cal sweeteners). But if that's what you're getting at, you shouldn't be arguing for that through a proxy argument about corn vs cane sugar.