Democrats hoping to blunt the impact of a recent Supreme Court decision allowing unlimited corporate spending on campaign advertisements can now call it a bipartisan effort, at least in the House of Representatives. On Monday evening, Rep. Mike Castle (R-Del.) signed on to yet-to-be-introduced Democratic legislation to force more disclosure of corporate expenditures and to ban foreign companies, federal contractors and bailout beneficiaries from spending on political campaigns. In a joint statement with Rep.