FDR Colored Poster NEED HELP!!!

I am needing some information on this poster. I picked it up at a flea market along with a couple of other depression era items. It is a colored poster of FDR that appears to be printed on some sort of woven tarp-like paper. It has "O.K. Press, Chicago" stamped on the bottom along with the Allied Printers Union stamp. It appears to have been hung in a window because there was tape on the corners with the glue facing to the front and the poster has some yellowing. I am just wanting to find out maybe why it was made and maybe what for. I have searched the internet for hours and cannot find a duplicate or the actual photo that it was printed after. Any help would be appreciated. Thanks a bunch!!!