民主党是左翼政党，是改革性质浓厚点的政党，政策比较偏向中产阶级，重视福利和公平，推动改革。共和党是右翼政党，代表的是大资本家的利益，政策比较容易被利益集团所左右，是保守性政党。
Democrats generally support a more progressive tax structure to provide more services and reduce economic inequality
Republicans emphasize the role of free markets and individual achievement as the primary factors behind economic prosperity. To this end, they favor laissez-faire economics, fiscal conservatism, and the promotion of personal responsibility over welfare programs.、
Environment
Democrats believe that the government should protect the environment and have a history of environmentalism. In more recent years, this stance has had as its emphasis alternative energy generation as the basis for an improved economy, greater national security, and general environmental benefits
Some Republicans are skeptical of anthropogenic global warming and question scientific studies on the impact of human activity on climate change Instead, they assert that global warming is part of a natural cyclical phenomenon, or is caused by a number of other alternative factors. The Republican Party has supported the protection of the environment.
Most Democrats have the long-term aim of having low-cost, publicly funded college education with low tuition fees (like in much of Europe and Canada), which should be available to every eligible American student, or alternatively, with increasing state funding for student financial aid such as the Pell Grant or college tuition tax deduction
Self-identified Republicans are significantly more likely than Democrats to have 4-year college degrees.
Social policies
Generally speaking, most Republicans have opposed government recognition of same-sex unions such as with same-sex marriage.
The Democratic Party has been divided on the subject of same-sex marriage, though support for it has been increasing and most of the support for same-sex marriage in the United States has come from Democrats. Some members favor civil unions for same-sex couples, others favor full and equal legalized marriage, and others are opposed to same-sex marriage on religious or ideological grounds. Support for same-sex marriage has increased in the past decade according to ABC News.
本文来源：https://www.2haoxitong.net/k/doc/bfbe0cf49e314332396893d4.html
文档为doc格式