The poll was conducted by San Jose State University's Survey and Policy Research Institute. The survey of 614 registered voters took place from April 13 to April 15 and has a margin of error of plus or minus 3.9 percentage points.
Voters favoring the measure are convinced there are enough safeguards in the deal between the city and 49ers to make the stadium a boost for the community.
Opponents say the cost of the stadium outweighs the trouble it would take to build it. Traffic impacts, noise, parking and pollution are other concerns for people who oppose the idea.