Filing MN taxes by snail mail, turbo tax also included an extra copy of my 1040 with the state return - do I need to sign the 1040 that is included with the state return?

Having to file by snail mail this year - Turbo Tax included an extra copy of my 1040 to go with my MN non resident state return.  Do I have to sign the 1040 or can it be sent blank?  The MN return is signed.