http://www.dcpoliticalreport.com/MAPoll.htm(this is a great site BTW)
among survey USA polls this is little change in the race, while other polls show it much closer.
Survey USA 1/30
Clinton 57%
Obama 33%
Other 7%
Survey USA 1/23
Clinton 59%
Obama 22%
Edwards 11%
Other 2%
Undec 6%
if anything, Obama picked up like 99% of Edwards' support and Clinton fell by 2%
Survey USA 1/16
Clinton 56%
Obama 23%
Edwards 14%
Other 3%
Undecided 4%
So this shows very little change.
Lets look at other contemporaneous polls
Rassmussen 1/28
Clinton 43
Obama 37
Edwards 11
WNEC 1/20-26
Clinton 43
Obama 15
Edwards 8
Other 3
and a shitload of undecideds (31%)
So don't start the party yet Clintonites. Only Survey USA has had clinton above 50%.