I don’t know, George Will? The Economist? The American Conservative? (despite Pat Buchanan’s erstwhile involvement.) I’m sure there must be a good number of relatively sober GOP senators. John McCain before his presidential campaign maybe.
It’s not that serious conservatives don’t attend or speak at CPAC at all, but they are not at all the focus of the event. Its purpose is to provide a highly visible platform for wingnuts to gain publicity by saying outrageous things so they can rile up the base, sell more books, and get on more talk shows.