Here.
And also in May 2012 in "Atlas is Starting to Shrug" here, steering another caller to the book and drawing parallels to current members of the 1% abandoning the rest of us.
Committed conservatives understand the difference between conservatism and libertarianism and choose the former. Rush still thinks there's room for both under a big tent, which just shows he does not fully understand how libertarianism is inimical to conservatism.