A major political donor to Sheriff Tom Dart is telling 19th ward insiders that the Sheriff is extremely 'frustrated' in his options in seeking higher office. The donor says Dart is considering County Board President as his only viable option. The source says Dart had political operative Joe Trippi run an underground poll against Emanuel and Preckwinkle. Source claims the Sheriff won both polls but is very concerned Emanuel would bury him with ads/money. Dart also considered running for Governor until JB Pritzker announced a run with an unlimited war chest. The source says Dart wants out of the Sheriff's office badly and a County Board Presidency run might be his only option..