Republican presidential candidate Mitt Romney yesterday popped in on a local pro-Issue 2 and Issue 3 call center and then refused to publicly endorse either Republican initiative. “Yes” votes on Issues 2 and 3 would keep Senate Bill 5 and allow Ohioans to opt out of mandatory health care passed by Congress last year, respectively. From CNN:"I am not speaking about the particular ballot issues," Romney said, only after repeated questions from reporters. "Those are up to the people of Ohio. But I certainly support the efforts of the governor to reign in the scale of government. I am not terribly familiar with the two ballot initiatives. But I am certainly supportive of the Republican Party's efforts here." Both topics are tricky for the Romney campaign. He is no stranger to health insurance mandates, having passed one of his own in 2006 while governor of Massachusetts. Meanwhile, the Republican-backed union legislation remains deeply unpopular in the state, which is all but certain to be a swing state once again in 2012.Romney also doesn't want to make his tax returns public. Too modest.