North Dakota Gov. John Hoeven (R) will announce his 2010 election plans Monday evening in Bismarck, N.D.Party officials expect Hoeven, who has a press conference scheduled for 6 p.m., to announce that he is running for retiring Sen. Byron Dorgan’s (D) seat.Dorgan shocked the political world last week when he announced he would not seek re-election in 2010, a decision observers speculate was driven by Hoeven’s likely entrance into the race.Both politicians are popular in North Dakota, but polls conducted late last year showed Dorgan trailing Hoeven by significant margins.