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I am a 2L with a 3 gpa (below median) and no job. I had two interviews with two different federal government agencies and today I received rejections from both agencies. The interviews were following a screener and lasted around 2/2.5 hours.

Since there isn't an HR/recruiting person, but the actual attorney who was my contact, how can I ask for follow up? I want some feedback from the interviews specifically what I can improve on, but at the same time I wonder if it's just my crap grades. I realize this is easier done for big law firms with a recruiting person, but should I even ask for feedback from the attorneys of a govt. agencies (or is that not done)?

Also, what should I write in my email back to them - thank you for the opportunity, I enjoyed my meeting with everyone? ... These were my only "call back" style interviews and have no idea what to do now.

I think you may be over thinking it. They are just like any other firm that has rejected you, so email the person who you had direct contact with in the interview and ask him your questions. At worst, he thinks you're annoying (highly doubtful). At best, he thinks that you're truly interested in bettering yourself; a great quality in a person. Further, they'll see that you're not just some other person who was denied and left it at that, which I bet most people do. You're looking to improve yourself, and your interviewing skills, something I believe most people aren't doing after being denied. Good luck!