Here's the quote that I view as Sowell supporting Miers.
I [ez] hold that the statement, "She may be the best choice he could make under the circumstances" represents Sowell supporting Miers.
You may indeed find that connection, but not many readers will. In the spirit of constructive criticism, it's damaging to one's credibility to misrepresent someone else's position (in this case, Sowell's) to "win" an argument. The "win" is an illusion, and one's reputation is involved in the cost.