By Bob Brigham Less than one week before Pennsylvania’s May 17 GOP primary, all eyes are on a Republican surging against Donald Trump’s endorsed candidate. “Influential Republicans in Washington and among the nationwide party elite are having a belated “oh s–t” moment over the previously unimaginable prospect that Kathy Barnette could win their party’s nomination for the open Senate seat in Pennsylvania,” Axios reported Wednesday. “In Barnette, who’s been soaring in the polls ahead of Tuesday’s primary, Senate Minority Leader Mitch McConnell would be dealing with a general election candidate …