While that's not surprising, the magnitude of the shift is, said Jean Craciun, president of Craciun Research Group, the Anchorage-based polling firm that conducted the voter survey between Aug. 30 and Sept. 4.

The six-day sample -- which began a day after McCain announced Palin as his running mate -- found that 51 percent of Alaska registered voters now support McCain, 36 percent support Obama and 12 percent of voters are undecided.

The poll surveyed 404 registered voters and has a margin of error of 4.9 percent.