How to Retweet a tweet on Twitter.com
Its a bit of a manual process but Neal walks us through it pretty well. First copy the tweet you want tweeted, than click the reply button, than before the @ symbol type "RT " for Retweet, and than leave a space after the user name and then paste the tweet after the user name. After this all you have to do is update in order to send the Retweet out into your feed. You have to make sure not to go over the amount of characters allowed in the Retweet.