We're in overtime for one of the year's most impactful primaries. On Tuesday, Pennsylvania Republicans will choose their nominee for a race that may decide which party controls the Senate in 2023. Which way they are leaning remains a complete and total mystery with a field that features three potent candidates: TV host Dr. Mehmet Oz, ultra-wealthy businessman David McCormick, and Fox News personality (& breakout star) Kathy Barnette.