Jonathan Narcisse, a former Des Moines school board member, will announce Saturday he will challenge Gov. Chet Culver for the Democratic nomination for governor. Narcisse will announce his plans to seek the nomination at a news conference at 10 a.m. at the Bob Mickle Center, 1620 Pleasant St. Narcisse, former co-chairman of the Polk County Democratic Party, has been signaling his interest in running ever since touring the state last fall conducting policy debates with Republican gubernatorial hopeful Rep. Chris Rants of Sioux City. Rants has dropped out of the race for the GOP nomination. It will be the first...