A new poll shows that Barack Obama has a 19-point lead over John McCain in Maine and that Republican Sen. Susan Collins maintains a 17-point lead over Democratic challenger Tom Allen.

The independent poll released Tuesday by Market Decisions also shows that a referendum question asking Mainers if they want to allow a casino to be built in Oxford County is too close to call.

With a week left before Election Day, the poll says 54 percent of those surveyed were for Obama, with 33 percent for McCain. Fifty-four percent were for Collins, and 37 percent for Allen. On the casino question, 49 percent said they were for a casino and 48 percent were opposed.

The poll found that 87 percent of likely voters who were surveyed were dissatisfied with the way things are going in the U.S., said Curtis Mildner, president of Market Decisions. Fifty-seven percent of those who said they were dissatisfied were for Obama, and 28 percent were for McCain; 15 percent were for someone else or undecided.