I believe the signatures have to be from registered voters, but they neither have to be nor can be verified as being from GOP voters, since there is no party registration in VA.
That speaks to the danger of a write-in option on a primary ballot. There is nothing stopping Democrats from organizing to write in the candidate of their choice on our ballot.
I learned from a subsequent poster that, despite comments made by Gingrich’s campaign manager, Virginia does not allow write-in candidates in the primaries.
So.