If you check out the copies of the original certifications as BO as dem nominee for President...the first one that was certified had language 'legally qualified under the United States Constitution'...another one was certified without those words...United States Respectively...she was in CYA mode...knowing he had eligibility problems.
That's right. She signed the certification papers.
OK, then it goes to Sheets Byrd. That would be fun!
The line of succession is what counts, and Byrd is a legally elected senator.