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LANSING, Mich. (AP) _ Democrat Jennifer Granholm continues to lead Republican Dick Posthumus in the governor's race, which has tightened since their respective primaries, a new poll shows.

Granholm had the edge, 55 percent to 42 percent, with 4 percent undecided, according to the survey by EPIC/MRA of Lansing. In May, Granholm led 48 percent to 29 percent when the pollster asked about their potential matchup. The two candidates were chosen in the Aug. 6 primary.

``We're encouraged by the fact that a lot of people know her and we're still doing well,'' Posthumus campaign spokesman Sage Eastman said Thursday.

Among those who said they were Republicans, 79 percent chose Posthumus, the lieutenant governor. Among voters who said they were Democrats, 90 percent sided with Granholm, the state's attorney general.

Granholm campaign spokesman Chris De Witt said the poll results were encouraging, even though they show the race tightening.

``We've gone through a very tough primary. Posthumus didn't,'' De Witt said. ``Traditionally Michigan gubernatorial races are very close, and we don't think that's going to change.''

In the U.S. Senate race, 62 percent said they favored Democratic incumbent Carl Levin, while 33 percent chose Republican state Rep. Andrew Raczkowski. Five percent were undecided.

The EPIC/MRA survey of 600 likely voters was conducted Sunday through Wednesday and has a margin of error of plus or minus 4 percentage points.