New Fox Poll: Clinton & Obama Lead Three GOP Candidates

In a new national poll just out from Fox News, Sen. Hillary Clinton (D-NY) has a big (and growing) lead over three major GOP contenders in head-to-head matchups (parenthetical numbers are from July):

46% (46%) Clinton (D)
39% (41%) Giuliani (R)

48% (47%) Clinton (D)
35% (38%) Thompson (R)

46% (45%) Clinton (D)
39% (42%) McCain (R)

The poll didn't test Clinton against Romney, and it didn't include former senator John Edwards (D-NC). The poll shows Sen. Barack Obama (D-IL) also leading against the three GOP contenders, but not by as much as Clinton (and his leads are shrinking):

41% (45%) Obama (D)
40% (41%) Giuliani (R)

45% (48%) Obama (D)
33% (30%) Thompson (R)

40% (47%) Obama (D)
38% (37%) McCain (R)

Among other findings, the poll puts approval of Bush at 34%, down from 37% right after the testimony of Gen. Petraeus before Congress. Approval of Democratic Party is at 50%, of the Republican Party is at 44%.