Marquette Poll: Obama 49%, Romney 48% in Wisconsin

National Journal reports that the Marquette Law School poll, which has been very accurate in recent elections, shows a dead heat in Wisconsin:

The Marquette Law School poll shows Obama leading Romney, 49 percent to 48 percent, well within the poll's margin of error of plus-or-minus 3.4 percentage points. Only 2 percent of voters remain undecided.   In late September, just before Romney's impressive performance in the first presidential debate, Obama held an 11-point lead, 53 percent to 42 percent.   Likely voters are split on the president's job performance: 48 percent approve, and 48 percent disapprove. A slim majority, 52 percent, view Obama favorably, compared to 45 percent who view him unfavorably.