U.S. factory equipment maker OTC Industrial Technologies has long used low-cost countries to supply components - first China and later India - but President Donald Trump's blitz of tariffs on numerous trade partners has upended the supply chain math for CEO Bill Canady.

State and local US races are seen as a political litmus test of Trump's performance.

"If we don't win that case, we will be a weakened, troubled, financial mess for many, many years to come," he said.