It's not the quantity of Senators, but the quality that counts. Have you already forgotten McCain and his band of 14 "moderates"?
You are absolutely right here. Lenin took Russia with a cadre of 20,000 committed commies, out of a nation of 160 million. The problem is that the cadre of committed conservatives in the Senate is about 15, with about 30 "sorta conservatives" and 10 "occasionally, once in a while conservatives." Reality says that sending up a "perfect" conservative nominee with a track record would be utterly useless.