Well, it's conventional wisdom. Here's a source that says bad weather suppresses...

Well, it's conventional wisdom. Here's a source that says bad weather suppresses turnout to the benefit of Republicans. http://blog.chron.com/sciguy/2012/10/weather-affects-electio...

The principle is the same.

We also have Republicans favoring and Democrats opposing laws requiring voters to show ID, because they both know which side benefits in relative terms from making voting more difficult.