I know of one - Bob Casey. There might be others. How about Gillebrand of NY?
Casey has a lifetime conservative rating from the ACU of 8%. Gillibrand isn't much better. They are both hardcore liberals.
Gillibrand is pro-abortion. Casey is pro-life, but liberal on everything else. The only other pro-life Dem in the Senate is Ben Nelson of Nebraska (who’s the least liberal Democrat in the Senate).