A Thursday poll shows Democrat Tom Wolf maintaining a large lead on incumbent Pennsylvania Gov. Tom Corbett, a Republican, in the November race.

The Franklin & Marshall College poll shows Wolf with a 49 percent to 24 percent advantage over Corbett. Twenty-five percent say they're unsure who they'll back.

These numbers fall in line with results the college released in June and buck the trend of two more recent polls that showed Corbett trailing by roughly ten points.

Wolf, a York County businessman, opened up a sizable lead following the May Democratic primary, helped by an onslaught of TV ads and a general negative view of Corbett.

Corbett, meanwhile, has been hurt by concerns over pension reform and taxes. Corbett has tried to push pension reform during his time in office, but it has stalled in the General Assembly. Wolf has worked to develop a plan overhaul the income tax.

The latest poll shows that despite Corbett's efforts this summer to be more aggressive with attack ads, he's been unable to gain ground with voters. Only 24 percent of those surveyed believe he is doing an "excellent" or "good job" in office, which is similar to the 26 percent he received in June. More troubling for Corbett is the lack of support he's getting within his own party. Forty percent of Republicans rate the governor's performance as "excellent" or "good".

The survey reflects the views of 520 Pennsylvania registered voters between August 18-25.