Apparently, Theodore Roosevelt was having a tiff with a political opponent when he was in the NY assembly, before he was president. Things were said, especially by Theodore, until his opponent gave a speech on the floor. Theodore realized that he had misjudged the man in question, and came down the isle to apologize with tears running down his face. I think that's in Edmund Morris' biography. (Of course he also decked a guy threatening him with a pistol in North Dakota, but that's different.)