I’m sure you have already seen this, but read the last 3 paragraphs of the article and you will know what the founders meant.
http://www.freerepublic.com/focus/f-chat/2299541/posts
If you want to make a case about citizenship I wouldn't quote Roger Taney, author of the Dred Scott decision, and the man who said that blacks were not and could never be citizens. He wasn't a founder, and he was dead by the time the 14th Amendment passed out of Congress.