Here's the new CBS News poll on 2008. For some reason, CBS News has been polling only the top three candidates on each side along with a "someone else" category. In their latest poll, they add Fred Thompson to the mix:

Republicans (without Thompson)
Giuliani 42 (+6 vs. last poll in May)
McCain 26 (+4)
Romney 8 (-7)
Someone Else 19 (-2)

Republicans (with Thompson)
Giuliani 34
Thompson 22
McCain 21
Romney 6
Someone else 7

Favorable Ratings (among Republican primary voters only)
Giuliani 52/12 (+40)
Thompson 33/3 (+30)
McCain 35/19 (+16)
Romney 24/11 (+13)

Does Candidate Share Your Values? Yes/No (among Republican primary voters only)
Thompson 44/8 (+36)
McCain 56/24 (+32)
Romney 38/15 (+23)
Giuliani 49/31 (+18)

Twenty-eight percent of Republican primary voters say McCain compromises "too much" with Democrats.

On the Democratic side, Clinton maintains a strong lead:

Democrats
Clinton 48 (+2 vs. last poll in May)
Obama 24 (nc)
Edwards 11 (-3)

Favorable Ratings (among Democratic primary voters only)
Clinton 67/18 (+49)
Obama 54/14 (+40)
Edwards 50/11 (+39)
Gore 55/20 (+35)
Richardson 7/11 (-4)

When expanded to include all registered voters, the favorable ratings look like this:

Obama 40/22 (+18)
Edwards 33/27 (+6)
Clinton 45/40 (+5)
Richardson 7/10 (-3)
Gore 34/40 (-6)