KENTWOOD – Jerome Bush, an 81-year-old lifelong Republican, shook GOP presidential hopeful Mitt Romney’s hand Wednesday, recalling doing the same with his father, George Romney, during his campaign for governor more than 40 years ago. “I voted for his dad,” said Bush, the former supervisor of Fillmore Township in Allegan County. “Right now, I’m still undecided if I’m going to vote for him.” It illustrates the difficulty the former Massachusetts governor is facing on the 2012 campaign trail. Three polls released Wednesday show Rick Santorum ahead of Romney in the state where he was born and raised, a place once...