(WHTM) – No clear front-runner is emerging for Republicans in the primary race for Pennsylvania Governor, according to a new Fox News poll.

Former Congressman Lou Barletta and State Senator Doug Mastriano are separated by one point in the poll with Barletta in the lead at 19%.

Delaware County businessman Dave White is in a close third at 14%, followed closely by former U.S. Attorney William McSwain at 11%.

President Pro Tempore of Pennsylvania’s Senate Jake Corman sits fifth with 6% in the Fox News poll. Scott Martin, who dropped out due to an injury, received 3% and Dr. Nche Zama received 1%

Similarly to older polls, 25% of Republican Pennsylvania primary voters are undecided in the race to replace term-limited Democratic Governor Tom Wolf.

Forty-one percent of the 960 respondents said they are certain to support their current candidate, but 57% say they may change their mind.

Twenty-three percent of the voters in the poll supported Barletta compared to only 14% of women, while 23% of women supported Mastriano compared to only 14% of men.

Voters who identified themselves as conservative or very conservative (42%) supported Mastriano compared to Barletta at 38%. Barletta had a 1% lead over Mastriano among voters who identify themselves as “GOP.”

Barletta and Mastriano were tied at 19% each among voters 45 and older while Barletta had 18% of support among voters under 45. White received 17% support among voters under 45.

According to the Fox News poll, the biggest issue on voters’ minds was the economy and immigration with more than 50% saying they’ll be “extremely” important to their decision.

Eighty-two percent of Pennsylvania voters have a favorable opinion of former President Donald Trump, who has not made an endorsement in the May 17 race.

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The Fox News poll did not include Democratic candidates with the party backing Pennsylvania Attorney General Josh Shapiro.

The Pennsylvania primary is scheduled for May 17.