Rasmussen is the latest poll with the highest sampling. However, Democrat polster PPP shows Romney leading Obama 47-45% as of December 18th, and the ABC/WAPO poll from the same period shows them tied.
A week ago, Romney trailed Obama 44% to 41%. The week before that, he held a slight 43% to 42% edge over the president. The two candidates have been essentially tied in regular surveys since January, but Romney remains the only GOP hopeful to lead Obama in more than one survey. Despite Romney’s current six-point lead, his latest level of support is in line with the 38% to 45% he has earned in matchups with the president this year. However, Obama’s 39% is a new low: Prior to this survey, his support has ranged from 40% to 46% in matchups with Romney.
The CNN poll from the 12/16-12/18 period show Obama leading Romney by 7 points, 52-45%,but I think I deconstructed CNN's polls for you pretty thoroughly quite recently.
It's early days, but we're probably seeing is a bit of a consensus coming together around Governor Romney as the GOP nominee and thus the anti-Obama.
I'll have more on this later.