Barack Obama is more popular than he's been in years. That could save Hillary Clinton.

President Barack Obama's job approval rating just hit 58% in a Washington Post/ABC News poll released this weekend — the highest it's been since 2009, shortly after he took office.

The survey found Obama's job approval rating above water among almost every demographic — including likely voters — and helps keep his average approval rating over 50%, according to RealClearPolitics.

His rising approval is news that Hillary Clinton can cheer.

According to the Washington Post, there is a strong correlation between a president's approval ratings and the amount of support for his party's candidate. And with Obama's over 50% and potentially rising, that could help Clinton in November.

"As presidential approval improves, so does the vote share of the president's party," the Post reported.

News of Obama's polling boost comes on the eve of his next big foray into the 2016 campaign.

On Tuesday, he'll head to Philadelphia, where he's expected to "urge Pennsylvanians to support Clinton and her vision for an America," according to an emailed news release from Clinton's campaign announcing the event.

Pennsylvania Democratic strategists say Obama's positive image in the state will make his message resonate — and help Clinton maintain her advantage in the Keystone State.

Clinton currently leads Donald Trump by an average of 6.2 percentage points in Pennsylvania, according to the RealClearPolitics average. Without winning the state, Trump's path to 270 electoral votes is slim.

"He's worked with her and he understands the type of leadership she would bring to the office," Michael Bronstein, a Pennsylvania-based Democratic strategist, said in an interview. "And there are very few people who can make that kind of endorsement the way a sitting president can."