GOP primary voters = conservatives, evangelicals, etc
General election voters = independents, Democrats, left wingers, etc as well as conservatives etc
It's a different electorate.
This is the same stupid argument that McCain and Romney used.
“Electable” Republican candidates lose because they alienate tens of millions of disaffected conservative voters who end up staying home instead of voting for GOPe candidates.
Only by appealing to Evangelicals, Tea Partiers, and Constitutionalists will a Republican presidential candidate win the crucial swing states of Pennsylvania, Virginia, and Wisconsin.