You can bet there is at least one prominent politician or celebrity who won’t be invited to the owner’s box atop Gillette Stadium on opening day for the New England Patriots in September. That would be U.S. Sen. Amy Klobuchar of Minnesota, a Democrat, who is running for president, especially after she made that crack about Robert Kraft at the annual iconoclastic Gridiron Club dinner in Washington the other night. Promising to be brief before a room full of reporters, Klobuchar opened by saying her remarks would be “shorter than a Robert Kraft visit to the Orchids day spa.”