Cruz is very viable as soon as he is declared eligible.
Could very well be on the ticket as VP and POTUS in 2020.
Legal minds like Levin thinks he is eligible, but that would mean Obama was eligible if he was born in Kenya.
Likewise if Osama Bin Laden or the Blind sheik raped an America woman and had a son born in Pakistan who lived with the Taliban until he was 30, the son would be eligible to be President of the United States too when he turned 35 years old.
Just logic, dont worry though, judges dont give a rats ass about logic.