berlin german prosecutors say wednesday investigate letter tell voters political preferences already work internet post need go poll sunday fake letter carry logo federal election authorities mean sender could guilty forgery say state prosecutor office wiesbaden message crude would surprise people fell spokesman federal election director say still frustrate indication behind letter appear base recent joke german magazine german government officials security experts look evidence meddle ahead sept. 24 national vote follow allegations russian interference poll unite state france german computer magazine carry satirical article month fictional voter tell vote automatically cast certain party give behavior internet credit card charge actual letter send german voters suggest voters would cast ballot party bible-abiding christians basic wage coalition rnd newspapers report prosecutors say investigation start complaint german federal election director whose office wiesbaden letter look real investigate possible forgery document spokesman prosecutor office say fake letter tell germans web work vote