Finding all people who follow Two particular Twitter accounts

I'm looking for new people to follow and network with on Twitter but I'd like to conduct a more targeted search rather than just randomly follow people who follow a particular Twitter account.

I'd like to input a list of 2 or more influencers' Twitter accounts and get a list of all Twitter accounts who are following every single influencer I specified on my input list.

(For example, suppose I want a list of all the people who are following both Mark Cuban and Barak Obama.)

Is there a tool out there that lets me do this? If not, would it be possible to program such a tool using the Twitter API?

Hello,

http://twiangulate.com/search/

Seems a bit slow but it works (plus I'm not in the mood to code today, lol.)

Try followerwonk