In 2008, Riemer joined the Obama presidential campaign, serving in Chicago as the National Youth Vote Director. His responsibilities included supporting the Campaign's operations in the early states (Iowa, New Hampshire) and working with student leaders to support the Students for Barack Obama network. Young voters were an important part of the Obama's early state voter coalition. After the Obama campaign, Riemer worked for AARP as a senior advisor on retirement security as well as community volunteerism.