One of the most common mistakes made in political reporting is to assume that average voter is following the daily news cycle as closely as we are. He or she isn’t. The latest poll numbers from the Pew Research Center on the Supreme Court’s decision on President Obama’s health-care law are (yet another) affirmation of that fact. Forty-five percent — yes 45 percent! — of respondents in the Pew poll either didn’t know what the court had done in regards the health care law (30 percent) or thought that the court had rejected most of the provisions of the law...