Gallup has been asking respondents for over twenty years their attitudes toward the Democratic Party, and towards the Republican Party. These polls are done approximately twice per year. Here are the latest results, from late April 2014. They show 44% of the voters have a favorable impression of the Democratic Party and 50% have an unfavorable impression. Also, 34% of the voters have a favorable impression of the Republican Party and 59% have an unfavorable impression. Thanks to Rick Kissell for the link.