Who are those 600 provisional voters?

Provisional voters are generally people who show up to a polling place to vote and are not on the precinct rolls but want to vote anyways. Today I heard of a person showing up at one of the precincts wanting to vote. He had a Texas license but insisted on his right to vote. And he should if he is a registered voter who can show proof of his voting status. Then it is up to the elections office to determine if they are actually eligible to vote. I wonder what % of these people will actually be involved in the final vote count locally. They can and may affect the outcome. Check out this link for more clarified description and qualifications of a provisional voter. http://ss.ca.gov/elections/hava/compliance_manual/chpt8_provisional_voting_and_free_access_final.doc