SurveyUSA interviewed 900 Indiana adults 09/28/08 and 09/29/08. Of them, 802 were registered to vote. Of the registered voters, 687 were determined by SurveyUSA to be likely voters in the 11/04/08 general election. Indiana has 11 Electoral College votes. George W. Bush carried Indiana by 21 points in 2004 and by 16 points in 2000. Polling conducted during an unprecedented time of economic and political turbulence.
It doesn't say for certain if it's a poll of "adults", "registered voters" or "likely voters". The fact that Bush won by 21 points in 2004 tells me Obama is going to lose Indiana by a lot more than the 3 point spread in this poll.
The same poll has Daniels leading Thompson 53% - 37% in the Governor’s race.