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Sugar imports coming from low cost production countries can impact prices from U.S. sources to some extent, but not significantly. They would drop by at least 50%. I call that significant.

This ironically, also plays into energy politics. Read this. http://www.newyorker.com/talk/content/articles/061127ta_talk_surowiecki

What’s stopping the U.S. from doing the same? In a word, politics. The favors granted to the sugar industry keep the price of domestic sugar so high that it’s not cost-effective to use it for ethanol. And the tariffs and quotas for imported sugar mean that no one can afford to import foreign sugar and turn it into ethanol, the way that oil refiners import crude from the Middle East to make gasoline. Americans now import eighty per cent less sugar than they did thirty years ago. So the prospects for a domestic-sugar ethanol industry are dim at best. We could, of course, simply import sugar ethanol. But here, too, politics has intervened: Congress has imposed a tariff of fifty-four cents per gallon on sugar-based ethanol in order to protect corn producers from competition. A recent study by Amani Elobeid and Simla Tokgoz, scientists at Iowa State University, projected that if the tariffs were removed prices would fall by fourteen per cent and Americans would use almost three hundred million gallons more of ethanol.
But that isn’t likely to happen anytime soon: the Bush Administration proposed eliminating the ethanol tariff this past spring, but Congress quickly quashed the idea—Barack Obama was among several Midwestern senators who campaigned in support of the tariff—and the sugar quotas appear to be as sacrosanct as ever. Tariffs and quotas are extremely hard to get rid of, once established, because they create a vicious circle of back-scratching—government largesse means that sugar producers get wealthy, giving them lots of cash to toss at members of Congress, who then have an incentive to insure that the largesse continues to flow. More important, protectionist rules flourish because the benefits are concentrated among a small number of easy-to-identify winners, while the costs are spread out across the entire population. It may be annoying to pay a few more cents for sugar or ethanol, but most of us are unlikely to lobby Congress about it.
Maybe we should, though. Our current policy is absurd even by Washington standards: Congress is paying billions in subsidies to get us to use more ethanol, while keeping in place tariffs and quotas that guarantee that we’ll use less. And while most of the time tariffs just mean higher prices and reduced competition, in the case of ethanol the negative effects are considerably greater, leaving us saddled with an inferior and less energy-efficient technology and as dependent as ever on oil-producing countries. Because of the ethanol tariffs, we’re imposing taxes on fuel from countries that are friendly to the U.S., but no tax at all on fuel from countries that are among our most vehement opponents. Congressmen justify the barriers to foreign ethanol with talk of “energy security.” But how is the U.S. more secure when it has to import oil from Venezuela rather than ethanol from Brazil? These tariffs are bad economic policy, bad energy policy, and bad foreign policy. Talk about your Domino effect.