North Dakota is not a state known for supporting Democratic candidates in Presidential elections. In the the past 80 years, it has only backed the Democrat three times- Franklin D. Roosevelt in 1932 and 1936, and Lyndon B. Johnson in 1964.
Notably, these three elections mark the three largest popular vote landslides by Democrats during that period of time. In 1932, FDR won nationally by a margin of 18%, in 1936 he won by 24%, and in 1964, LBJ defeated Barry Goldwater nationally by 22%. No other Democratic presidential candidate has run up a double digit margin during that period, with FDR coming closest in 1940, winning by 9.9%. (And, it should be noted, losing North Dakota.)
This year, however, North Dakota may be in play. While President Bush won the state in 2004, 63% to 35% over John Kerry, the most recent polls of the state, by Research 2000 and the Fargo Forum, place the 2008 race in a dead heat.
This may be a reflection of a wider trend in rural areas. A survey of rural voters in 13 battleground states released in late October by the Center for Rural Strategies, showed Sen. Obama and Sen. McCain tied among rural voters. In September, similar polling by the center had shown McCain with a 10 point lead among rural voters. According to Reuters, in 2004, President Bush "won rural districts nationwide by 19 points."
If the recent 2008 polling proves accurate, Tuesday night may be an unhappy evening for McCain supporters, with Sen. Obama facing the possibility of winning by a healthy margin, potentially bringing rural states such as North Dakota along for the ride.