I only had two mid/large firm callback interviews, and almost all of my interviewers told me not to be discouraged if I didn't get an offer, that it's much easier to get an offer as a 2L. I'd give you the same advice--cast your net wide and keep your chin up. Also, everyone I know who has worked for a federal judge over the summer has said that it's great experience, if you can afford the lack of income for a summer.