The Eighth Circuit has determined that a conviction for soliciting prostitution in Minnesota qualifies as a crime involving moral turpitude. The court rejected the petitioner's argument that the statute did not require a sufficient level of intent or that the statute of conviction included conduct that was not reprehensible.
The full text of Gomez-Gutierrez v. Lynch can be found here: http://media.ca8.uscourts.gov/opndir/16/01/143374P.pdf