Even though the the tweet button does support SSL I am getting the following error.
"The page at https://s7.addthis.com/static/r07/tweet018.html#href=... ran insecure content from http://urls.api.twitter.com/1/urls/count.json..."
https://dev.twitter.com/docs/tweet-button/faq
"Does the Tweet Button work over HTTPS?
Yes, the tweet button works over HTTPS."