TOPICS Conventional Wisdom Welfare reform (+) Make ’em work? Clinton’s harder line will make him work for liberal votes. Health care (+) Kerrey’s big plan means big payroll-tax hike. But at least he has a plan. Protectionism (+) Recession pressure for trade barriers. Will Bush flip-flop? Impossible! (Sure.) Immigration (+) Buchanan wants to build a “trench” along borders. CW sez: Let him jump in. Pacs (-) “Populist” Harkin is top PAC-man. But “Brown’s shrill shtik discredits issue. TV ads (+/-) You went negative first! No, you did! Boys will be boys in the weeks ahead.