From politico.com comes this blog about Rep. David Obey (D-Wisconsin), who is the House Appropriations chairman (emphasis is mine):

‘If they ask for an increased troop commitment in Afghanistan, I am going to ask them to pay for it.’ Obey, a Democrat, made it clear that he is absolutely opposed to sending any more US troops to Afghanistan and says if President Obama decides to do that, he’ll demand a new tax — what he calls a ‘war surtax’ — to pay for it..