what does "As opposed to the rest of us"mean?
【The next day he informed Ken O'Donnell and Larry O'Brien, his two chief political advisers. Congressman Albert Thomas of Houston, who was present, recalled later that the three of them “fell over backward.” She had never been to Texas or the Southwest; hadn't, indeed, been west of Middleburg since the election. When Salinger told the press on November 7 it was news everywhere. Lady Bird wrote her from the ranch, “The President's on page five, Lyndon's on the back page, but you're on the front page,” and Charlie Bartlett, a newspaperman and family friend, phoned Kennedy that a St. Louis news dealer had informed him, “That girl's got brains.” The President commented dryly, “As opposed to the rest of us, I suppose.” But to her he said, It really shows, doesn't it? When you aren't around all the time, you're so much more valuable when you do come.” Clearly he was delighted.】
1.does "That girl's got brains." mean "she is cleaver?"
2.what does "As opposed to the rest of us"mean?
3.in "It really shows, doesn't it?", what does this "it "indicate?
4.does "When you aren't around all the time, you're so much more valuable when you do come" mean "if the president do not come here, people here will support him more?"