Tarrant County, TX, List of Registered Voters for 1867 [http://www.rootsweb.com/~txtarran/tax/1867vote1.htm] lists a "J. P. Davis" /Pct. 2 /Time of residence: 11 years /Born in Kentucky
See LDS Pedigree Resource File (CD #24 Pin #337762) [http://www.familysearch.org/ENG/Search/frameset_search.asp?PAGE=AncestorSearchResults.asp%3Ffirst%5Fname%3Djames%26last%5Fname%3Ddavis%26fathers%5Ffirst%5Fname%3D%26fathers%5Flast%5Fname%3D%26mothers%5Ffirst%5Fname%3D%26mothers%5Flast%5Fname%3D%26spouses%5Ffirst%5Fname%3Djemima%26spouses%5Flast%5Fname%3Dtuttle%26from%5Fdate%3D%26to%5Fdate%3D%26date%5Frange%3D%26standardize%3D%26juris1index%3D%26juris2index%3D%26juris1friendly%3D%26juris2friendly%3D%26event%5Findex%3D%26testing%3D%26juris1%3D%26juris2%3D%26juris3%3D] for further information. (The actual URL wouldn't fit into the database: 521 characters long!)
James P. Davis served as Tarrant County Sheriff during the last county administration in place prior to the Provisional Government taking over during Reconstruction. Though the story that James P. Davis was once Sheriff of Tarrant County was repeated to me often, most lists of former county officials do not include the name.