Describe the Process by Which the Major Parties Select Their

Describe the process by which the major parties select their presidential candidates currently, and compare it to the way parties selected their presidential nominee prior to 1972. What are the main changes that were made in the process? To what extent does the current process improve the representation of party identifiers? Does the current process give the greatest power over nominations to the party in the electorate, the party organization, or the party in government? Explain your answer.