MADISON, Wis. -- Tuesday's primary marked exactly eight weeks until November's presidential election, and a new Wisconsin poll shows Democrat Barack Obama leading Republican John McCain in the state.

The poll from Strategic Vision shows Obama leading McCain by three points, 46 to 43 percent with 8 percent undecided.

The survey was conducted from Sept. 5 through Sept. 7 and has a margin of error of plus/minus 3 percent.

The results show a closer race than a similar poll in August, which showed Obama with a 5 point lead.