About this question:
why the founders imposed the natural born Citizen requirement for presidential candidates but not for congressional candidates.
Ted Cruz is clearly a citizen but the question the Constitution poses is; were his parents citizens?
I'm don't why we should care. The question is: is Ted a natural born citizen?
I think that logically you have three - and only three - choices:
1. Ted is not a citizen.
2. Ted is a naturalized citizen.
3. Ted is a natural born citizen.
Is it your position that he is #1 or #2?