New 2008 poll from Newsweek:

Democrats
Clinton 43 (no trend)
Obama 27
Edwards 14
Kucinich 3
Richardson 2
Undecided 7

Clinton's lead in the updated RCP Average is 13.5%.

Republicans
Giuliani 27 (no trend)
Thompson 19
McCain 15
Romney 12
Huckabee 4
Undecided 8

Giuliani's lead in the updated RCP Average is 7.1%

Head-to-Head General Election Match Ups
Clinton 51 - Giuliani 44
Clinton 50 - McCain 45
Clinton 55 - Romney 40
Clinton 53 - Thompson 42

Obama 49 - Giuliani 44
Obama 51 - McCain 41
Obama 53 - Romney 37
Obama 53 - Thompson 39

Edwards 48 - Giuliani 46
Edwards 50 - McCain 44
Edwards 57 - Romney 36
Edwards 54 - Thompson 38

Three Way General Election Matchups
Clinton 46 - Giuliani 37 - Bloomberg 11
Clinton 46 - McCain 35 - Bloomberg 13
Clinton 48 - Thompson 33 - Bloomberg 13

Obama 44 - Giuliani 38 - Bloomberg 11
Obama 46 - McCain 35 - Bloomberg 11
Obama 47 - Thomspons 32 - Bloomberg 14

On the question of Michael Bloomberg's possible run as an Independent, 65% said they were either "not too likely" or "not at all likely" to vote for him. Only 5% said they were "very likely" to vote for him, with another 21% saying they were "somewhat likely."