For a law practice that does all of its work on a pro bono basis, you might think the Liberty Justice Center has no problem finding clients. But for an operation that has a specific goal in mind — advancing “economic liberty” and related causes — and has just one lawyer on staff, finding who to represent is the toughest part of the job. “It’s challenging to find clients,” said Jacob H. Huebert, senior attorney at the LJC. “You can see that laws are unjust and know that …