Former president Barack Obama is set to join the campaign trail at the end of October, hosting rallies in Michigan, Wisconsin and Georgia ahead of the midterms. His office said Saturday that he will appear at an event in Atlanta on Oct. 28 to campaign for U.S. Sen. Raphael Warnock, Stacey Abrams and others. On Oct. 29 he will join Michigan Gov. Gretchen Whitmer and Lt. Gov. Garlin Gilchrist at a rally in Detroit. Then later that day he will campaign for Wisconsin lieutenant Gov. Mandela Barnes, Attorney General Josh Kaul and others in Milwaukee. The office said it would release news about other campaign stops at a later date. Democrats will be hoping Obama’s appearances will energize the base and encourage turnout.