Top Senate Ag Republican Pat Roberts is demanding answers from USDA Secretary Tom Vilsack on taxpayer-funded food stamp radio ads modeled after Spanish Soap Operas. Roberts does not think the ads help efforts to get a farm bill done. Roberts wrote Vilsack for a full accounting of taxpayer-funded SNAP promotional campaigns for the last 10 fiscal years - including languages used, food stamp dollars spent, states and entities funded and sign-up results…