Consider the graph of U.S. House and Senate Reelection Rates, 1964-2018. Which of the following statements does the data in the graph support? Incumbents often lose elections to challengers who are more extreme in their viewpoints. Being an incumbent significantly increases your chance of winning a congressional election. The incumbency advantage is strong in the Senate but not in the House. The incumbency advantage has been weaker since the early 1980s