Looking into your problem, I find a curious situation.

The Oregon Marriage Index, published much later by the state, says that Anna J. McMullough married Joseph S. Fuller [not Turner] in Lake County on 12 November 1910. (This is a comparatively derivative record.)

On the other hand a transcription of the Lake County marriage records (from volume 3, page 60) says:
On 12 November 1910 Joseph S. Fuller and Anna J. Ross [not McCullough] were married at the county courthouse by County Judge B. Daly, witnessed by F.W. Payne and Nell Simpson. (This is about a close as one can get to the original without being in Lake County.)

(Lake county was (and is) not very densely populated, so there wasn't another marriage there until November 20 and the previous marriage was on 2 November, so there shouldn't have been any confusion about who was marrying whom.)

Attached is the newspaper coverage of this marriage from the Lake County Rustler, 17 November 1910, page 1, column 1.

I see this couple, Joseph S. Fuller (age 53) and his wife Anna J. (age 50) in the 1920 census of the town of Lakeview, on West Street. And again (ages 63 and 59) in the 1930 census in the town of Lakeview. Both censuses say Anna was born in Oregon. The 1930 census says Anna was first married at age 17, but apparently that wasn't to Joseph.

I also see in the Oregon Death Index that an Anna Fuller (whose husband was Joseph) died in Lake County on 3 February 1937. Her gravestone can be seen at
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=fu...;
It says her name was Julia Ann Fuller and that she was born in 1869.

Her obituary is also attached. It is from the Lake County Examiner, 4 February 1937, page 8, column 2.

In the end I really don't think your person had anything to do with this marriage in the outlandish Lake county.

(You should keep in mind when looking at American censuses from that period that it was fairly common for women to tell the census taker that they were widowed when they were in fact divorced. So you can't conclude for certain that Anna's husband was dead by 1920.)