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:
C
Remember last election,
C
Everybody was in action,
C                                    G7
Tryin to find themselves a president
G7
There was a man named Lawson,
G7
From New York down to Boston,
D                                       G
Representing the colored people we had sent

Verse Two:
C
My brother was a voter,
C
also a great promoter,
C                      G7
goin round givin advice
D
They'd go to the poll and vote
D                                 G7
Instead of voting once he voted twice

Chorus:
C
He's in the jailhouse now
F                      C
He's in the jailhouse now
    F                    D7
We got him down town in jail
    C             A7
No one to go his bail
C            G         C
He's in the jailhouse now