Des Moines Register: Gannett Co. said today that its board has unanimously rejected an unsolicited proposal to be acquired by media company MNG Enterprises Inc., also known as Digital First Media, saying the proposal undervalues the company and the board doesn’t believe the offer is credible. MNG on Jan. 14 offered to buy Gannett for $12 a share in cash, which at the time was a 23 percent premium above its most recent closing price of $9.75 a share. Gannett owns the Des Moines Register.