In what's come to be a familiar pattern, a new poll (this one from Rasmussen) shows Obama having cut Clinton's lead in an upcoming primary state (in this case, Ohio) by nearly half.
Ohio by Rasmussen. 2/21 (2/13). 902 likely voters. MoE 3%.
Clinton 48% (51)
Obama 40% (37)
Clinton lost and Obama gained support in equal measure; this is the first poll I've seen recently that showed Clinton under 50%. In another familiar pattern, Clinton has maintained her lead among women, with Obama's gains coming from men, among whom he is now ahead.