Which of the following posed a major stumbling block to bill clinton's political agenda?

a. republican gains in the 1994 midterm elections
b. the president's centrist approach
c. an increasingly troubled economy
d. the supreme court

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.