The same folks that pay BJ Clinton to speak.
Clinton, bless his little heart, is an entertaining and engaging speaker. He is able to hold the attention of his audience, make them laugh, throw in bits of information that keeps a talk interesting.
Aside, from being a lofty speaker, I have never heard anybody say that about Obama. Aside from a few university speeches and, after about 6 months or so, I am expecting Obama to disappear into his beach home chooming away to his heart’s content.