Remember when Margaret Thatcher got some rather adverse press reaction for declaring that she would go "on and on and on"? Gordon Brown just did the same thing during a lamentable performance on Woman's Hour. He was asked by Jane Garvey if he would resign if he didn't get a majority, he replied that he would "go on" till he got one.
The Labour Party might have something to say about that, of course. Although if they run true to form they'd wimp out of getting rid of him and let him lead them to the next disaster.