John Taylor: " The [national] debt was 41 per cent of GDP at the end of 1988, President Ronald Reagan's last year in office, the same as at the end of 2008, President George W. Bush's last year in office. If one thinks policies from Reagan to Bush were mistakes does it make any sense to double down on those mistakes, as with the 80 per cent debt-to-GDP level projected when Mr Obama leaves office?"