By Helen Coster (Reuters) – Donald Trump’s stolen-election falsehoods have thrust America’s voting machine suppliers into a national struggle to protect their businesses. Industry leaders Dominion Voting Systems and Election Systems & Software are waging a political and public relations ground war to beat back threats to their state and local government contracts, rooted in bogus conspiracy theories about vote manipulation. Dominion has also turned to the courts, filing eight defamation lawsuits against Trump allies and media outlets including Fox News. The efforts to fight misinformation have…