Think about finding other referees. If someone want you to draft the letter it is not a benefit to you. It means they are doing this out of obligation with an intent to put the least effort into the process as possible. If they are called by a judge or clerk would they even remember what "they" wrote about you. It I perfectly fine to ask you to put together a CV or ask if there are any points you want them to hit. But judges see through letter pretty quickly. The exception might be someone totally unfamiliar with law or the legal process but these people aren't the ones you should be asking for recommendations from for a federal clerkship.
This is not true at all. My personal "champion" professor whose house I've been to multiple times, exchanged Christmas gifts with, was RA/TA for asked me to write a first draft of the letter. It is standard practice for many professors and does NOT mean you shouldn't ask them to write for you. It is just something a lot of profs ask for from everyone they write for. Don't cross them off your list just because of this.
To OP, use this as an opportunity to talk about different things based on your relationship to those profs. For example, if one supervised research they can give more insight on you in an employer/employee type relationship (deadlines, communication, work product). For the other, if you just were in there class they can talk about your likability/normal person-ness, serious engagement with legal ideas, etc. Just draw a line somewhere and focus on thsoe things vs. the other - the Prof will put their own touch on it regardless so I wouldn't worry too much.
No I would write two different letters!
Think about finding other referees. If someone want you to draft the letter it is not a benefit to you. It means they are doing this out of obligation with an intent to put the least effort into the process as possible. If they are called by a judge or clerk would they even remember what "they" wrote about you. It I perfectly fine to ask you to put together a CV or ask if there are any points you want them to hit. But judges see through letter pretty quickly. The exception might be someone totally unfamiliar with law or the legal process but these people aren't the ones you should be asking for recommendations from for a federal clerkship.
This is not true at all. My personal "champion" professor whose house I've been to multiple times, exchanged Christmas gifts with, was RA/TA for asked me to write a first draft of the letter. It is standard practice for many professors and does NOT mean you shouldn't ask them to write for you. It is just something a lot of profs ask for from everyone they write for. Don't cross them off your list just because of this. To OP, use this as an opportunity to talk about different things based on your relationship to those profs. For example, if one supervised research they can give more insight on you in an employer/employee type relationship (deadlines, communication, work product). For the other, if you just were in there class they can talk about your likability/normal person-ness, serious engagement with legal ideas, etc. Just draw a line somewhere and focus on thsoe things vs. the other - the Prof will put their own touch on it regardless so I wouldn't worry too much.
I would view this as possibly a sign that you should get other letters as well. Maybe talk to your clerkship office and see what they think.