The $1 Kickstarter pledge is a powerful, helpful tool for campaigns
What good does pledging $1 do for a Kickstarter? This article sheds some light on the practice, and gives some good information about why $1 backers are so important. It's not just about raising money, but building a community, and then communicating with those people in a way that will make them stick around.
I never thought about pledging $1 to campaigns just to keep up with things, but this story convinced me that it's a good, easy way to keep my finger on the pulse of what's going on in crowd funding.
Hell, even if the people behind the campaign just get to use your vote in their PR, that can be incredibly helpful. Being able to tout a large number of backers is helpful for any number of publicity efforts during the campaign, and the $1 pledge allows you to be counted in that lot and show your support. It's not a bad deal.