December 22 was the deadline for Republican presidential candidates to submit petitions to be on the Virginia presidential primary ballot. Four candidates submitted petitions. However, two of them submitted fewer than 12,000 signatures. Mitt Romney submitted 16,026; Ron Paul submitted 14,361; Rick Perry submitted 11,911; and Newt Gingrich submitted 11,050. The requirement is 10,000, with at least 400 from each U.S. House district in the state.
No one else submitted a petition. Candidates who are on all other Republican presidential primary ballots so far, but who did not submit a petition, include Michele Bachmann, Jon Huntsman, and Rick Santorum.
The Republican Party of Virginia says it will check the petitions for validity. However, the party had already previously said that any candidate who submitted at least 15,000 would be deemed to have submitted a valid petition. It would be surprising if the Perry and Gingrich have enough valid signatures. It is generally unheard of for any petition (other than one with a very tiny requirement) to have a validity rate as high as 83%. See this story, which is the source of the information for the exact number of signatures submitted.