If you want to pledge for a pin, sticker sheet, or combo package, that helps a lot of course, but it isn't the only way.
Following and sharing the campaign itself, maybe once a day, does a lot to help reach the goal. Kickstarter does a little to spread the word, but that's mostly up to me, and to fans of the project.
Likewise, it helps a ton to follow us on social media, and interact a lot with posts about the campaign (and other posts you like)-- Most social media networks decide how many people see a post based on how much interaction there is. Comments, shares, likes, etc. all go a long way.
Facebook: http://4th.me/fb "The Fourth Place"
Twitter: http://4th.me/twitter @4thplacegames
Instagram: http://4th.me/ig @4thplacegames