Pennsylvania Senate contender David McCormick leads competitor Mehmet Oz among Republican primary voters in a new poll commissioned for the super PAC supporting his campaign.

The survey showed McCormick, a former hedge fund executive, leading Oz 22% to 16% in the closely watched race for the Republican nomination for Senate in Pennsylvania. Both McCormick and Oz, a physician and television host known as “Dr. Oz,” are investing millions of their own personal fortune to win a spot on the November ballot.