Hillary Clinton’s lead over Donald Trump in Pennsylvania has grown to a substantial 11 points, a week before election day, a new Franklin & Marshall College poll shows.

The widening lead in the key battleground state is in contrast to a recent national poll, where Clinton had a 2.5-point lead.

Poll director G. Terry Madonna, a political scientist who has observed Pennsylvania politics for decades, said he’s never seen a presidential candidate come back from even a four or five-point deficit with only a week left.

“This was always the toughest state for Trump to win,” Madonna said of the four battleground states the Republican’s campaign targeted: Pennsylvania, Ohio, Florida and North Carolina. “When’s the last time you saw a Trump lead in this state? You’d have to go back to June.”

At 49 percent against Trump’s 38 percent among likely voters, the Democratic nominee Clinton has a decisive edge in the Keystone State — an improvement from her 9-point lead a month ago.

Most of the polling in Pennsylvania was conducted before FBI Director James Comey publicly alerted Congress on Friday that the bureau had new information that could be pertinent to its initial investigation into Clinton's use of a private email server when she was secretary of State.

The F&M poll, conducted Oct. 26 to Oct. 30, surveyed 652 likely voters — majority were interviewed before the surprise FBI news broke Friday.

The poll has a margin of error of plus or minus 5.1 percentage points.

The RealClearPolitics average of all Pennsylvania polls has Clinton ahead by 6 percentage points. Nationally, she leads by 3.1 percentage points.

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The number of still undecided voters could be a key factor, Madonna said.

“I am willing to admit that this is weird election and that we could have people who are going to vote who are genuinely conflicted,” he said.

The candidates’ favorability ratings have largely remained stagnant after a month of debates and controversies for each presidential ticket.

For Trump, revelations of him talking inappropriately about touching women in a 2005 video — comments he described repeatedly as “locker room talk” — led to at least a dozen women coming forward to allege he had sexually assaulted them. For Clinton, the possibility of a renewed probe into her emails came as Republicans continued to also criticize links between the Clinton Foundation and her time as secretary of state.

She is now viewed favorably by 46 percent of Pennsylvanians and unfavorably by 52 percent. Trump’s favorable-unfavorable rating is 35 percent to 62 percent, the F&M survey found.

Consistent with previous polls, Pennsylvanians still believe Clinton is better equipped to handle the job of president. They believe she is the better candidate on foreign policy, economic policy, “character and good judgment” and overall experience needed.

Among inter-party support, more likely Democratic voters support Clinton at 81 percent compared to 74 percent of likely Republican voters who support Trump.

Clinton’s support comes from sizable leads in the Philadelphia and Pittsburgh areas, and the vital counties surrounding Philadelphia — where she leads 64 percent to 28 percent. Meanwhile, Trump is ahead in central, southwest and northwest parts of the state, along with a narrow 44 percent to 42 percent lead in the northeast.

The poll, conducted by F&M’s Center for Opinion Research, surveyed 863 registered voters including 418 Democrats, 327 Republicans and 118 independents. The sample was weighted by gender, region and party registration to reflect the state's political demographics.