1948 Presidential elections is the correct answer.
Explanation:
A way of political campaigning in which the politician makes series of brief appearances and speeches at towns with a private railroad or observation cars is known as Whistle stop tour. The 1948 US presidential election was held on November 2, 1948. In this election President Harry S Truman defeated republican governor Thomas E Dewey. He utilised whistle stop tour for campaigning. It was a non political trip and the speeches during this trip helped him to improve his image and represent himself as an engaged speaker full of ideas and programs for the common citizen, it helped him to win the elections. His speeches were the key to victory.
