There is a not very fine line between issues that should concern a president and issues on which a Fox News commentator should spend his or her time. This was made very evident last week. On Tuesday night President Obama gave his State of the Union address. State of the Union addresses are a rarely compelling form of political theater, but they are significant because they allow the president to present his agenda and goals to the American people. On Thursday night, by contrast, the remaining four Republican presidential candidates engaged in what seemed like their 400th debate. Actually it was only their 19th.