The negative ads that marked the presidential contest may be gone, but a different political battle is keeping the airwaves crackling: the so-called fiscal cliff. These ads focus on the stakes involved in allowing the mix of tax increases and spending cuts to take effect in January and are funded by advocacy groups, including labor unions that want to protect entitlement programs and business groups opposing higher taxes. Some are running on national cable television stations, others in the states and districts of lawmakers who could help broker a deal.
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