McCain makes it formal - kind of

Sen. John McCain (R-Ariz.) eliminated any lingering doubts about his plans for 2008 and announced late Wednesday that he will seek the presidency. 'I am announcing that I will be a candidate for president of the United States,' McCain said on 'The Late Show with David Letterman.' But the senator noted that his statement was not the 'formal' announcement, which he will make in April.