Here's a smart little essay about the importance of political candidates penning and mailing a thank you card to supporters especially if they make a donation.
But other reasons to show gratitude via snail mail include: hosting a meet and greet; taking a yard sign; making phone calls; and writing a letter to the editor.
In this social media age, some, wrongly, assume that old-school thank you notes are too old-school. Au contraire. That personal touch is still appreciated and goes a long way in helping a candidate stand out from the competition.