Where did you get that info?  He got the plaurality of 7 states and was a finalist of candidates.  .5% seems very low to me.  
google it that's how I found it.  and .5% was a high, most websites quoted .3%.   you are more than welcome to post your own results if it contradicts mine.
edit: oh crap i was wrong the above information is wrong.  it looks like he got .5% of the vote for the republican nomination.  he got something like 50,000 votes in the 2008 presidential election.   sorry my bad  

semp