one who studies the pattern of voting in election
That would be a Political Scientist. Political scientists are experts who specialize in studying the patterns and behaviors related to voting in elections. They analyze various factors such as voter demographics, political campaigns, social and economic factors, and public opinion to understand voting patterns and make predictions about election outcomes. By conducting research and analyzing data, political scientists provide valuable insights into the voting behavior of individuals and groups, helping to understand and explain the dynamics of elections.