This is an interesting article that indicates just how profoundly elections had changed after 1920, when women began to vote. Previously, when the voting booth was a gender-specific domain intended strictly for that North American species known in academic circles as the Homo Americanus, the victory margins were seldom greater than 10%. Starting with the 1920 presidential election and continuing through the election of 1936, dramatic differences could be seen between the winners and losers.
Written in an imaginative and seemingly fanciful manner that, happily, is no longer admired among American journalists, the article is illustrated with a helpful chart that clarifies any questions you may have about these contests.
The journalist also believed that the advent of radio broadcasting also had a contributing factor in these elections.