Should the circumstances arise, it looks like half the work is already done for us:
List of all SuperdelegatesThey are also neatly divided by who they support. Contact information is often found in external links as well.
Most of us know that in order for Hillary to legitimately present a case to the superdelegates, she has to win the national popular vote because there's no way she can win the pledged delegate race. Including estimates for caucus votes, Obama currently has ~700,000 vote lead. With that in mind, a SurveyUSA poll just came out for Pennsylvania. The results? 55-36 Clinton, a 19 point lead.
Now, based on the turnout in Ohio and Illinois, - two similarly sized states - I estimate turnout in PA to be around 2,300,000. Factoring in a 19-20 point victory for Clinton, which my gut says is her ceiling in the state, results in her closing the popular vote gap by about 450,000. How does she make up the remaining 250,000 votes? That's what the Clinton campaign needs to figure out.
I only bring this up because for there to be a deadlocked convention, Hillary needs to somehow start convincing supers to side with her. This may be the only way she can do it.