The Republican presidential primary might turn out to be a race between incoming votes for the candidates on one hand, and public and press scrutiny of U.S. Sen. John McCain of Arizona on the other. He hid in the sun until late in the race, protecting himself from the kind of intense attention that can kill an insurgent campaign, and the Bush folks didn't have him on their radar until he was well into the fight. They were paying attention to Steve Forbes, the spoiler four years ago. McCain is benefiting at this stage from voters' willingness to look at something fresh. He might hold up just fine when people begin to look more closely. Or, he might turn into Ross Perot, who was initially attractive to the press and the public before close attention revealed his quirks and drained his support.