Make sure your paper is analytic. Argue for an analytic (or "positive") stance, rather than a normative one. In other words, engage in "objective" rather than "subjective" analysis. Answer the question "what is?", rather than the question "what should be?".
Research Strategies
Clearly state your specific question. Your question is a case of a more general set of political phenomena. Know the literature from the more general set.
Compare your political phenomenon of interest to models of how politics works in such cases.
Understand counterarguments, alternative explanations, and
competing hypotheses to your own. Refute them to the extent possible.
Content
Be clear whether you're making descriptive or causal claims.
Make claims that are falsifiable. How would you know if you were wrong? What evidence would disagree with your argument?
In making causal claims, the nature of the implicit or explicit comparison group is important.
Discuss measurement, modeling, design, and data
strategies. Discuss limitations of your approaches.
Web sources should exclude wikis, include full citations (including access date), and be kept to a minimum. When possible, cite the original published document instead of the web version.
Style
Be clear.
Be concise.
Be coherent.
Formatting
Submit your paper with a title page containing the title of the paper, author names, the date, a word count, and an abstract of 150 words or fewer.
Papers written for PS3551, "The Welfare State and Social Policy in America" should be of 3000 words or fewer.
Include words that are in section headings,
footnotes, in-text citations, and table or figure
captions.
Exclude words that are on the title page, or are in the bibliography.
Double-space the content of the paper; single-space
footnotes, captions, and the bibliography.
Provide 1 inch margins on all four sides.
References in the text should employ a consistent formatting style. Check a book or article for its style, and emulate it.
Further advice
On writing nonfiction, read William K. Zinsser's On Writing Well (noting that academic writing is different than humor writing, e.g.)
On writing for publication, read Gary King's online notes and PS: Political Science and Politics article (PDF version).
On citation, see the APSA citation style, the Chicago Manual of Style, and the MLA Handbook.