This poll is from American Research Group (ARG).
Barack Obama leads Hillary Clinton among men 51% to 43% (47% of likely Democratic primary voters) and Clinton leads Obama among women 57% to 33%. Clinton leads Obama among white voters 52% to 39% (90% of likely Democratic primary voters), Obama leads Clinton among African American voters 75% to 19% (6% of likely Democratic primary voters), and Clinton leads Obama among Latino voters 57% to 37%.
Overall, Clinton leads Obama 50% to 41%. And among Democrats, Hillary's lead is even larger.
Wisconsin
Likely Democratic Primary Voters
Democrats (63%) Independents (37%)
Clinton 56% 41%
Obama 36% 50%
Someone else 1% 1%
Undecided 7% 8%
A win in the blue state of Wisconsin would be huge for Hillary.