A grass-roots conservative group is launching a $1 million ad campaign to persuade key senators to oppose the reform measure. Keeping Small Business Healthy, a project run by the advocacy group Institute for Liberty, will begin airing ads targeting five Senate Democrats in four relatively conservative states. Each ad features small-business owners from the specified state warning of the dire consequences if Democrats' health-reform proposals become law. Groups on all sides of the debate have combined to spend more than $170 million, according to the Campaign Media Analysis Group.