The big news today about Hillary Clinton is that GOP hatchet man Darrell Issa wrote to her two years ago and asked if she had used a private email account while serving as Secretary of State, but she never replied.

WASHINGTON — Hillary Rodham Clinton was directly asked by congressional investigators in a December 2012 letter whether she had used a private email account while serving as secretary of state, according to letters obtained by The New York Times.

But Mrs. Clinton did not reply to the letter. And when the State Department answered in March 2013, nearly two months after she left office, it ignored the question and provided no response.

But there’s a small problem with this “gotcha” story. If Clinton used her private email account exclusively for correspondence with government officials (as she has acknowledged), how could they not know it wasn’t a State Department account? The address would have been right there on every email she sent.

Am I missing something? Because this story looks foolish on its face.