Now that voting's underway, here is more about how it seems to be working.
It's effectively one vote per household; they're blocking IP addresses from voting more than once to prevent fraud. That means all your home computers count for ONE vote, since they all log onto the internet through the same IP address. Send your hubby to work with the url, and your cardmaking child can use their phone if it's not using the home's internet connection. Just make sure everyone's voting just once.
Wait a full 24 hours before voting again. Even if trying from your work computer, you'll be blocked from voting if it hasn't been a full 24 hours. That means vote at the same time each day to maximize the number of votes you can cast all month long!