Based on % of the vote for the candidate, not the margin.
2012:
R: Utah
D: Hawaii
2008:
R: Oklahoma
D: Utah
2004:
R: Utah
D: Massachusetts
2000:
R: Wyoming
D: Rhode Island
1996:
R: Utah
D: Massachusetts
1992:
R: Mississippi
D: Arkansas
1988:
R: Utah
D: Rhode Island
1984:
R: Utah
D: Minnesota
1980:
R: Utah
D: Georgia
1976:
R: Utah
D: Georgia
1972:
R: Mississippi
D: Massachusetts
1968:
R: Nebraska
D: Rhode Island
1964:
R: Mississippi
D: Rhode Island
1960:
R: Nebraska
D: Rhode Island
1956:
R: Vermont
D: Georgia
1952:
R: Vermont
D: Georgia
1948:
R: Vermont
D: Texas
Thanks for the statistics, although I think you made a mistake regarding the Democrats' best state in 2008.