wordpress voting plugin that doesn't require registration and limits to one vote
i'd like to run a contest on a wordpress site where people submit articles. i post the articles and give visitors the ability to vote on their favorite article.
easy enough, but there's some stipulations:
1. I do NOT want to force visitors to have to sign up/register for my site
2. I want to limit it to one vote per IP address.
3. I need to offer an unlimited amount of submissions
all the plugins i've found don't offer all three stipulations.
any idea of any polling plugins out there that do?
please advise. thanks in advance!