Sen. John McCain says he won't be surprised if an influential conservative group that supports President Bush's tax-cutting plan targets him in attack ads. But Club for Growth President Stephen Moore says the group has no such plans. McCain remains among four Republican senators who have joined with Democrats in opposing Bush's $550 billion tax-cut plan. His appears to be a key swing vote with the president needing just two more to gain Senate approval. But the Washington, D.C.-based Club for Growth, which has been running TV spots attacking two other Republican holdouts, Sens. George Voinovich of Ohio and Olympia...