Last month Christie led Clinton in a head to head, 45/42. Now Clinton has the upper hand on him at 45/43. That's similar to the small leads Clinton holds over the rest of her potential Republican opponents- she's up 45/43 on Bush, 46/44 on Ryan, 46/43 on Huckabee and Paul, and 47/41 on Cruz.
Clinton's leads might be modest but there's not much doubt Democrats would be in a far, far better position with her than any of their other potential candidates. Even with Christie's declining popularity he would still lead Elizabeth Warren by 9 points (43/34) and Joe Biden by 11 points (46/35) in hypothetical contests.
(...)
Christie's problems are even bigger with the overall electorate though. His net favorability has dropped 27 points in a month from +12 at 43/31 to now -15 at 31/46. He's gone from having the best numbers of the potential Republican candidates to the worst in the span of a month. Christie had been popular because of his unusual amount of appeal to Democrats and independents. But now he's become deeply unpopular with both of those groups, dropping from 38/36 to 20/58 with the former and from 46/28 to 29/44 with the latter.
http://www.publicpolicypolling.com/main/2014/01/huckabee-up-clinton-down.html#more
