Dont know if you're still following this thread or not but I do believe the person you're looking for may be James K Polk Mullins b abt 1845 in Kentucky. He was a son of Joseph Gentry Mullins II, b. 1822 and Joanna Little. The reason why I believe this is your guy is because Ive been researching his brother Edmund who reportedly moved to Wisconsin to be with his son Edward. So it appears that James K Polk Mullins, and Edmund/Edmond/Edward Mullins were both living in Wisconsin at the same time.