By BRIAN BAKST, Associated Press Writer ST. PAUL, Minn. - David Bischoff thinks he got a raw deal last year when state gambling regulators raided his bowling alley, shut down his weekly Texas Hold 'em poker tournament and confiscated his cards and chips. For months afterward, the threat of criminal charges hung over Bischoff — and his card tables sat vacant — until prosecutors concluded that Minnesota's laws against poker were too vague to enforce. Minnesota is now one of several states where legislators are looking to clarify laws dealing with card games at a time when poker is becoming an al