A seemingly offhand comment by President Donald Trump may have caused more than political rumination; it’s now causing turmoil in commodity markets, with impacts for ETF investors.On Wednesday, Trump said Coca-Cola Co KO was considering making the move from high-fructose corn syrup (HFCS) to cane sugar for its U.S. drinks. Although the soft drink giant hasn’t made any announcement, the statement was sufficient to cause shares of corn refiners Archer-Daniels-Midland Co ADM and Ingredion Inc INGR to decline i ...