Vandals smashed a storefront window at Democratic presidential nominee John Kerry's campaign office in Grand Rapids.
Police discovered the damage about 2:45 a.m. Tuesday. A chunk of concrete was thrown through the window.
Campaign workers temporarily boarded the shattered window pane with a red, white, and blue wooden table top.
John Otterbacher is a spokesman for the Kerry-Edwards campaign in Kent County. He says he doesn't think it was an accident.
Kim Yob, the county's Republican Party chairwoman, doubts the vandalism was politically motivated.