The conservative tea party challenger who was narrowly beaten in the Republican primary by U.S. Rep. Bill Shuster says he will run against the eight-term incumbent -- as a Democrat. Art Halvorson, a retired Coast Guard captain from Bedford County, received more than the 1,000 write-in votes in the Democratic primary. ... Halvorson has called Shuster too moderate, and the challenger touts himself as a tea party-backed conservative Christian. Shuster is the House Transportation Committee chairman and is Pennsylvania's highest-ranked member of Congress. He beat Halvorson in the 2014 Republican primary, but his second victory over Halvorson in April was...