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Doris Kearns Goodwin On Teddy Roosevelt and the Progressive Era | On Point with Tom Ashbrook:
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Bully pulpit - Wikipedia, the free encyclopedia 
A bully pulpit is a position sufficiently conspicuous to provide an opportunity to speak out and be listened to.
This term was coined by President Theodore Roosevelt, who referred to the White House as a "bully pulpit", by which he meant a terrific platform from which to advocate an agenda. 

Roosevelt famously used the word bully as an adjective meaning "superb" or "wonderful", a more common usage in his time than it is today. (Another expression which survives from this era is "bully for you", synonymous with "good for you".)

a bully pulpit - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.

"an important job or position that someone can use to persuade other people to accept their ideas"

i.e. "The presidency is a wonderful bully pulpit to convince the country of the need for a balanced budget."