Republican presidential candidate Mitt Romney, seeking to avoid an embarrassing defeat in Michigan’s Feb. 28 primary, is racing to woo party voters by taking on two of his home state’s icons: unions and cars.

Romney, the son of an auto company executive-turned- Michigan governor, has bashed labor bosses at almost every campaign stop in the state this week, vowing to pass laws making it harder for workers to organize — particularly the powerful United Auto Workers union.