This is from an article on the Newsweek website:
May 5, 2007 - It’s hard to say which is worse news for Republicans: that George W. Bush now has the worst approval rating of an American president in a generation, or that he seems to be dragging every ’08 Republican presidential candidate down with him. But According to the new NEWSWEEK Poll, the public’s approval of Bush has sunk to 28 percent, an all-time low for this president in our poll, and a point lower than Gallup recorded for his father at Bush Sr.’s nadir. The last president to be this unpopular was Jimmy Carter who also scored a 28 percent approval in 1979. This remarkably low rating seems to be casting a dark shadow over the GOP’s chances for victory in ’08. The NEWSWEEK Poll finds each of the leading Democratic contenders beating the Republican frontrunners in head-to-head matchups.
Here is some interesting observations about the leading Democratic presidential hopefuls from the poll:
While the poll has some high marks for Clinton, it’s not all good news. Though the New York senator and former first lady aims to project an aura of inevitability that she will win the Democratic nomination, Obama beats the leading Republicans by larger margins than any other Democrat: besting Giuliani 50 to 43 percent, among registered voters; beating McCain 52 to 39 percent, and defeating Romney 58 percent to 29 percent.
Like Obama, Edwards defeats the Republicans by larger margins than Clinton does: the former Democratic vice-presidential nominee outdistances Giuliani by six points, McCain by 10 and Romney by 37, the largest lead in any of the head-to-head matchups. Meanwhile, Sen. Clinton wins 49 percent to 46 percent against Giuliani, well within the poll’s margin of error; 50 to 44 against McCain; and 57 to 35 against Romney.
According to the poll, where Clinton does well is among Democrats:
Where Clinton remains the undisputed champ is among Democrats. When matched against her main rivals for the Democratic nomination, Clinton is the choice of 51 percent of Democratic and Democratic-leaning voters over Obama’s 39 percent; and she defeats Edwards 57 percent to 38 percent. Obama has not substantially narrowed Clinton’s lead since the early March NEWSWEEK poll, where he trailed Clinton by 14 points. Edwards has narrowed Clinton’s lead over him though. Back in March Edwards trailed Clinton by 31 points; now her lead is down to 19 points.
On the Republican side, McCain is cutting into Giuliani's lead:
Giuliani, the Republican frontrunner, might want to look over his shoulder too. Among Republicans and Republican-leaning voters, Giuliani leads McCain 56 percent to 41 percent (15 points). But two months ago in the NEWSWEEK Poll, Giuliani held a 25-point lead. Both candidates trounce Romney, despite his placing first in the first-quarter fundraising sweepstakes. Giuliani holds a staggering 51-point lead over Romney and McCain holds a 41-point lead over the former Massachusetts governor.
The poll also shows that 60% of the Democrats surveyed would like to see former VP Al Gore enter the race, but only 32% of Republicans would like to see Newt Gingrich enter the race. Democrats survey were satisfied with their party's presidential candidates by a 77% to 14% margin but Republicans were only satisfied with their choices by a 52% to 38% margin. This could mean that if any one of the Republican nominees could be running in an environment where a substantial minority of Republicans aren't happy with their party's nominee.
You can see the actual poll results here and you can read the article here.