“…Get Out the Vote experiments typically include a remark such as “Can I count on you to vote?” (Gerber and Green, :150), which is similar to a pledge. Michelson, Bedolla, and McConnell explicitly use pledge or commitment theories to underpin their field experiment on the use of repeat phone calls to increase voter turnout, arguing that it is the act of making a commitment, whether written or verbal, which motivates people to follow through on their promise (Michelson, Bedolla, and McConnell, ). Our approach differs from these voter mobilization campaigns in that we ask participants to make a more active response to the pledge invitation, requiring some additional effort on their part, completing and posting a pledge card, making a phone call, or sending an email.…”