These results are from the newest Economist / YouGov Poll -- done between December 24th and 27th of a random national sample of 1,662 adults (including 1,419 registered voters) and has a margin of error of 2.9 points.
It shows that the public is not really enamored with either of the two major parties, but they continue to favor the Democratic Party over the Republican Party by a small margin. The Democrats have a 5 point lead in favorable ratings, while the Republicans have a 4 point lead in unfavorable ratings.
Only two groups favor the Republican Party -- white and those over age 65 (and both groups are getting smaller with each passing election). Men are evenly split between the parties. Women, age 18-29, age 30-44, age 44-64, Blacks, and Hispanics all prefer the Democratic Party.