it can be done by the losing candidate regardless of the difference...so I would imagine if it gets low enough (i'd say around 25-30k), Kerry would recount because there are 93,000 ballots which were not counted.
Source:
Recount – In Ohio a recount is automatic for statewide election if difference in the vote is within 0.25% of the total votes cast. For a recount is the presidential race, this is probably about a 19,000- vote margin between Kerry and Bush. Only a losing candidate can request a recount. A recount may always be requested regardless of the closeness of the race. The recount is requested by the losing candidate. The request for a recount must be made within 5 days of the official announcement of the results by the Secretary of State. The fee for a recount is set by each Board of Elections and may be between $5 and $10 per precinct. You can limit the recount to specific precincts. The cost is deposited by the person making the recount request at the time of the application based on the number of precincts requested to be recounted. The entire recount and contest procedures are outlined at ORC 3515.
http://www.ohiodems.org/index.php?display=ReleaseDetails&id=191152