Read
this article for more details.
+5 = Very favorable
-5 = Very unfavorable
Zero is not an option.
Like Gallup, I'll do 1960 and onwards.
1960:
Kennedy - +4
Nixon - -3
1964:
Johnson - +1
Goldwater - -3
1968:
Nixon - -4
Humphrey - +2
Wallace - -5
1972:
Nixon - -4
McGovern - +5
1976:
Carter - +4
Ford - +4
1980:
Reagan - -4
Carter - +4
Anderson - +2
1984:
Reagan - -4
Mondale - +4
1988:
H. W. Bush - -2
Dukakis - +3
1992:
Clinton - +2
H. W. Bush - -2
Perot - -1
1996:
Clinton - +1
Dole - -2
Perot - -2
2000:
W. Bush - -4
Gore - +3
2004:
W. Bush - -4
Kerry - +3
2008:
Obama - +4
McCain - -3
2012:
Obama - +3
Romney - -4