Spamming the Hobo Blog

I have this person or something, maybe a program spamming or posting all the time in the comments section of one page on my blogs. Very annoying, I need to learn or figure out how to BAN him or her.

I am not sure if blogger.com has this option to ban, however it is quickly becoming a need, I have to go and delete and this is not easy for me.
http://www.hobotraveler.com/2005/04/newsletter-from-la-paz-bolivia.html

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