Imagine going to vote for your presidential candidate and pushing the button on a touch-screen voting machine -- but the "X" marks his opponent instead. That is what some voters in Nevada, North Carolina, Texas and Ohio have reported. But in response to the growing number of complaints, the Republican National Committee has sent a letter to election officials in six states -- Ohio, Nevada, Kansas, North Carolina, Missouri and Colorado -- demanding tighter controls on touch-screen machines. Multiple voters from several states wrote Fox News to report problems similar to what Stevens reported. "While it is possible for a...