From a reader:

Chait anticipates your argument in the part of his article that Douthat takes out:
“It’s not because there are fewer of them than there are economic
conservatives. A detailed Pew survey last spring found that
“enterprisers,” who favor smaller government, comprise slightly less than
a third of the GOP voting base. The other two groups, “pro-government
conservatives” and “social conservatives,” tilt right on cultural values
but have moderate or even liberal economic views and outnumber the
enterprisers by more than two to one.”