Gail Collins: Don’t be dense, beware Mike Pence

It’s possible you failed to notice, but the Republican convention has a theme for each night. The list sounds a little like a Lord of the Rings theme park: Land of Promise, Land of Opportunity, Land of Heroes and Land of Greatness.You know Donald Trump’s big day is going to be Land of Greatness, right? Well, obviously. But do you think even the president felt a little wave of irony when he gave Mike Pence responsibility for Land of Heroes?Lots of ways you could celebrate Pence’