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