If you're connecting through proxy, then virtually anybody on the same network can vote before you do, and the vote will only count once. If you were really desperate to "rig" the poll, you can get yourself a list of http proxy servers and vote to your heart's content, connecting via differing IPs (other countries, locations, .mil, .gov, .edu, .nz, .co.jp, all the american dsl/cable isps, sweden you name it) and visit boredofstudies and start voting, but that is... of course, if you're THAT insistent on rigging the poll
Or, if you're on broadband, you can start switching NICs around and re-configuring routers and your TCP/IP stack, or forcing ISPs to dish out dynamic IPs for you via DHCP servers and scripts (taking advantage, yes...
)
But as for iambored, if you're on dialup, then that's even better, one vote per day, from a non-static (dynamic) IP, voting all the time. Again, a proxy (scan them, get your own list, do whatever you want) to get a socks 4/5/http one and you can pretty much remain anonynmous -- it'll be the "real" owner of the IP who gets the blame for "using up" votes
*shuts up*