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Because corn syrup is made from one of the five no-no grains, it's considered
chametz and is therefore forbidden during Passover (along with anything made from wheat, oats, barley, rye, and spelt). The grain constraints are, of course, a nod to the Jewish exodus from Egypt; the Israelites fled in such a hurry that they didn't have time for baked bread to rise.
Enjoying Kosher-for-Passover pop of course doesn't require being Jewish. It requires a love for more refreshing, crisper cola. The eight-day pop-slurping fest—er, commemoration of the liberated Israelite slaves—starts tomorrow at sundown, but the kosher sugar-high is already available in grocery stores.
According to a
forum on the beverage industry site BevNet, it's been spotted at Gelson's and Ralph's in California, Kroger in the Midwest, and a variety of Eastern European markets in Chicago and Brooklyn neighborhoods.