A virtually unknown Wisconsin businessman will attempt to be this year’s David Brat, the upstart who shocked the political world in 2014 and knocked off the sitting House majority leader in the Republican primary. Paul Nehlen next week will formally kick off his campaign to unseat House Speaker Paul Ryan, R-Wisc. A onetime Ryan supporter, Nehlen said he became dismayed after his Congressman voted to give President Obama the ability to negotiate a massive trade pact with Pacific Rim countries. He said he grew more frustrated by Ryan’s vote for a budget that funds Obama’s domestic priorities. “I arguably was...