Candidates need 1,000 signatures to get their own names on Ohio presidential primaries. Also, they need separate petitions for their candidates for Delegates. The Delegate petitions need 50 signatures within any particular U.S. House district.
Only the Democratic and Republican Parties are currently ballot-qualified in Ohio. Republican presidential candidates who turned in the 1,000-signature petition are: Giuliani, Huckabee, McCain, Paul, Romney, and Thompson. Democrats who turned in the 1,000-signature petition are: Biden, Clinton, Edwards, Kucinich, Obama, and Richardson. This list is not necessarily final. Also, Ohio checks petitions, so just because a candidate submitted a petition is no guarantee that he or she will qualify. Furthermore, not every candidate who submitted the 1,000-signature petition necessarily did U.S. House delegate petitions in each district.
Although Joe Biden withdrew on the evening of January 3, his campaign had already submitted his Ohio statewide petition, so he will probably be on the ballot unless he withdraws. Chris Dodd did not submit a petition; he also withdrew on the evening of January 3.