More from the NBC News/WSJ Poll

Head-to-head:

Obama 45, McCain 42.

Dates conducted August 15-18. Error margin: 3.1 points.

By Age:

18-34: Obama 55, McCain 38; 35 and older: 43 McCain, 42 Obama

Undecided: 13 %. Clinton supporters make up nearly half of the undecided.

Issues:

Health care: Obama 48, McCain 27

Environmental issues: Obama 47, McCain 21

Economy: Obama 42, McCain 30

Iraq: McCain 46, Obama 36

International crises: McCain 52, Obama 27

Terorism: McCain 51, Obama 23

How closely will McCain follow Bush policies? 77 closely, 22 not closely