Being born to at least ONE American citizen anywhere, including Canada or Kenya or the planet Neptune will suffice as NBC so that is not any more of an issue than other phonies like the dead DC Madame's Little Black Book or Heidi Cruz quarterbacking some Bircher nightmare for Goldman, Sachs and the CFR (!!!!!) in her spare time.
BTW, bad analogy. Mark Steyn was born a British citizen in Great Britain to two British citizen parents, went to Canada as an adult and became a Canadian citizen (IIRC) and then moved to New Hampshire but has not taken naturalized citizenship (the only kind he would qualify for). Too bad he wasn't born here or that he alternatively did not have one American parent. He might have made a lot better POTUS than Obozo, Comrade Bernie, Comrade Grandma and at least one Republican I could name but won't since I am probably forced to vote for him over Comrade Grandma. Nice try. No cigar.
Giuliani's record on the so-called social issues is offensive, as is Romney's...but we'd have been much better off the past four years in many areas with either of them as President instead of Obama...I wouldn't have trusted either of them to make a really good pick for the Supreme Court but whomever they nominated to replace Scalia wouldn't have been as bad as the guy Obama is offering us.