HARRISBURG - In the shadow of Pennsylvania’s status as a battleground state in the presidential election, Democrats will fight to defend their gains in Congress two years ago and, possibly, add another seat or two as the state’s suburbs continue to turn against President Donald Trump.

Meanwhile, Republicans are trying to defend their survivors in more evenly divided districts, while hoping to knock off some of the Democrats’ freshmen and one veteran congressman who keeps winning a district where Trump is popular.

Elections in 2018 were fruitful for Democrats: Aided by redrawn districts and anti-Trump fervor, they picked up four seats in Pennsylvania, evening the state’s partisan balance in the U.S. House and helping the party recapture the House majority overall.

There may be room for more districts to flip. Two incumbent Republicans won by fewer than 3 percentage points in 2018, while Democrats represent two districts that Trump won in 2016.

Here is a look at key races:

7th district

Freshman Democrat U.S. Rep. Susan Wild is defending her Allentown-area seat against Republican nominee Lisa Scheller, a former Lehigh County commissioner who started a pigment manufacturer for paints, coatings and inks and touts her background as a recovered addict who advocates for people in recovery.

Wild, a prominent lawyer in Allentown, scored a 10-percentage-point thumping of her Republican opponent in 2018’s campaign for what was an open seat.

The district is daunting for a Republican: Democrats have a 62,000-voter registration advantage, and Wild had a three-to-one campaign cash advantage going into July.

But Trump only lost the district by 1 percentage point in 2016, and Republicans are hoping his top-of-the-ticket strength can lift Scheller, who had Trump’s endorsement in a contested primary.

8th district

Four-term Democratic U.S. Rep. Matt Cartwright in northeastern Pennsylvania is in his third go-round of seeking reelection in a district where Trump is decidedly popular.

This time Cartwright is being challenged by Jim Bognet, a first-time candidate who won a six-person GOP primary, in part, by promising to be a staunch Trump ally.

The district is anchored by Scranton and Wilkes-Barre, both Democratic bastions. But the party’s voter-registration advantage in the district - still at a considerable 62,000 - is shrinking, and Republican hopes of capturing the district are perennial.

Cartwright, though, had six times the campaign cash as Bognet going into July and phone-banking help from Service Employees International Union.

Bognet said his fundraising is accelerating and that he’s been out door-knocking. Plus, he said, the last time Trump was on the ballot, Cartwright only faced token opposition.

Plus, the district is a regular destination for Trump and Vice President Mike Pence, which could give Bognet a boost.