Final answer:
The person who made a political/economic speech at the 47th National FFA Convention was not specified. Notable instances of significant televised speeches include Richard Nixon's 'Checkers speech' in 1952 and John F. Kennedy's debate in 1960. Public appearances at national conventions like those by Bill Clinton in 1988 and Barack Obama in 2004 played crucial roles in their political careers.
Step-by-step explanation:
The individual who made a political/economic speech live on national television from the 47th National FFA Convention was not explicitly mentioned in the provided references. However, significant speeches in the political and economic domain often occur at national conventions or significant political events. Such speeches have the power to influence public opinion and garner national interest. For example, televised speeches during presidential campaigns like those of Richard Nixon's 'Checkers speech' in 1952 and John F. Kennedy's speeches have played pivotal roles in shaping their public personas and addressing nation-wide audiences.
It is known that televised political events and debates, like the one between Kennedy and Nixon in 1960, have had a substantial impact on voters' perceptions, as the more telegenic Kennedy was judged to have won the debate by those who watched it on television, while radio listeners felt Nixon performed better. Furthermore, figures like Bill Clinton and Barack Obama used national convention speeches for political positioning and exposure, the latter rising to prominence with his speech at the 2004 Democratic National Convention.