With Vikings' quarterback Gus Frerotte listed as doubtful for Sunday's game against the Cardinals, the team's playoff hopes rest of the shoulders of Tarvaris Jackson. Jackson, who began the season as Minnesota's starter, was benched in Week 2. However, he played well in emergency duty last week after Frerotte was injured. He went 8-for-10 for 105 yards and a touchdown to rally the Vikings to a 20-16 win over the Lions.