Ron Paul was on the November 2008 ballot for president in Louisiana and Montana. Those two states only accounted for 1.9% of the national presidential vote this year. However, Paul received votes in those two states equal to .82% (of the total presidential vote in those two states). Consequently, he received the highest percentage of the vote (in the areas in which he was on the ballot) of any presidential candidate last month, other than Barack Obama and John McCain.
Whether Ron Paul was a “candidate” for president in November 2008 depends on the definition of “candidate”. He did not ask to be put on the ballot.