Of all our great presidents, Theodore Roosevelt is the only one whose greatness increased out of office. When he toured Europe in 1910 as plain 'Colonel Roosevelt,' he was hailed as the most famous man in the world. Crowned heads vied to put him up in their palaces. 'If I see another king,' he joked, 'I think I shall bite him.' Had TR won his historic 'Bull Moose' campaign in 1912 (when he outpolled the sitting president, William Howard Taft), he might have averted World War I, so great was his