Does this twitter tool exist?

Hi everyone, I was wondering if someone could help me, I have a twitter account with 3000 followers and I would like to know if there is any method to automatically add all those followers to another account.
I am doing it manually but is a tedious job,

All sugestions will be welcome

Thanks.

with www.tweetbuddy.com you can either add a list of twitter ids to follow or point it to your account and follow your followers