Because it turns out that Democrats are fair-weather voters.

Literally.

A new study of voter behavior confirms something political operatives have long suspected: rain hurts Democrats and helps Republicans. The study found that 1 inch of rain reduces overall turnout by slightly less than 1 percent and cuts the Democratic vote by 2.5 percentage points.

“Rain does have a significant effect decreasing the Democratic vote share,” said Brad Gomez, a visiting professor of political science at the University of Georgia who co-authored the study. “That’s a fairly sizeable swing.”

By analyzing weather and voting data since 1948, Gomez and his colleagues, Thomas Hansford and George Krause, calculated how many voters stayed home because of rain and snow. During the especially rainy 1992 election, 666,000 voters stayed home, but Democrat Bill Clinton won the presidency by such a large margin that it did not affect the outcome.

There’s a point here to make about liberals and only being willing to do something for their country when it’s convenient to them, but this election season has me so worn out I can’t make it.