Internet tax supporters are hoping that a vote in the U.S. Senate as early as today will finally give them enough political leverage to require Americans to pay sales taxes when shopping online.

Sens. Mike Enzi (R-Wy.) and Dick Durbin (D-Ill.) are expected to offer an amendment to a Democratic budget resolution this week that, by allowing states to "collect taxes on remote sales," is intended to usher in the first national Internet sales tax.

"We're working overtime in pushing this, talking to our members, activating our grassroots," says Stephen Schatz, a spokesman for the National Retail Federation. The group's board members include OfficeMax, Macy's, the Container Store, and Saks, which argue it's only fair to force Americans to pay sales taxes when buying from online retailers.