Chords by Chase Chafin
http://www.facebook.com/ChaseChafinandTheConductor

This song is way more complex and just strumming chords, but this at least gives you 
some thing to go by.
There's also a tabbed out version here:

tabs.ultimate-guitar.com/b/blind_blake/hes_in_the_jailhouse_now_tab_778148id_19012009date.htm

Verse One:
CRemember (x32010@1)last election,
CEverybody (x32010@1)was in action,
C (x32010@1)                                  G7Tryin (320001@1)to find themselves a president
G7There (320001@1)was a man named Lawson,
G7From (320001@1)New York down to Boston,
D (xx0232@1)                                     GRepresenting (320003@1)the colored people we had sent

Verse Two:
CMy (x32010@1)brother was a voter,
Calso (x32010@1)a great promoter,
C (x32010@1)                    G7goin (320001@1)round givin advice
DThey'd (xx0232@1)go to the poll and vote
D (xx0232@1)                               G7Instead (320001@1)of voting once he voted twice

Chorus:
CHe's (x32010@1)in the jailhouse now
F (133211@1)                    CHe's (x32010@1)in the jailhouse now
    F (133211@1)                  D7We (xx0212@1)got him down town in jail
    C (x32010@1)           A7No (x02020@1)one to go his bail
C (x32010@1)          G (320003@1)       CHe's (x32010@1)in the jailhouse now