Looking for advantages as they battle for Senate control, Republicans and Democrats alike are raising questions about where various senators and candidates say they live.

Democrats question whether congressman and Senate candidate Tom Cotton owns property in Arkansas. Republican Bill Cassidy notes that Louisiana Sen. Mary Landrieu lives in Washington while claiming her parents’ residence in New Orleans as her voting address.

Republican Senator Pat Roberts of Kansas survived a primary challenge after defending himself for listing his official address as a room in a contributor’s home. In New Hampshire, the Republican nominee is former Massachusetts Sen. Scott Brown, who moved before launching his latest campaign.