brotherhood_of_LAN - 9:04 pm on Jun 2, 2013 (gmt 0)
It seems /comments/vote.php is getting a 200 response. Is that part of your site?
Either way you could ban the IP in .htaccess, and serve a much smaller 403 response rather than the 75 Kilobyte vote.php file.
Seems a script is broken or it's a low tech way of abusing your site... one IP hammering your site shouldn't be a big deal to you or your host.