General Motivation Letter. The general requirements are: being research inclined, a demonstrated passion for Politics, and an above average performance. Your motivation letter has to be different than that of others.

A Motivation Letter or cover letter is a personalized document accompanying your CV.
Students typically send these letters to universities when they are applying for special programs, such as a study abroad opportunity.
A motivation letter is one of the essentials of your application to a US university. A motivation letter is a document detailing your professional skills and reasons for applying for a course of study, a scholarship or volunteer job. Your motivation letter has to be different than that of others.