If you are a member of Poll Daddy, then you might have gotten an email in your inbox this morning regarding Poll Daddy. In that email, it was stated that users will be required to connect a WordPress.com account to use the service starting December 3rd. Poll Daddy will be providing a friendly reminder on their website until this date. After this date, you will not be able to log into your account until you connect a WordPress.com account.
I took two parts of the email the sent me and screenshotted it for your viewing.
If you have questions, you can email their support team. As far as I know I'll have to make a WordPress.com account to now just use Poll Daddy. I don't think that this is the best decision, and I hope that you can use some Single Sign On login, such as OpenID or a social network instead of making another account.