Virginia and Maryland tied their transportation funding plans to the anticipated sales tax revenue that has yet to materialize.
In 2013, the Senate passed an online sales tax bill, but the House did not.
Sens. Dick Durbin (D-Il.), Mike Enzi (R-Wyo.), Lamar Alexander (R-Tenn.) and Heidi Heitkamp (D-N.D.) sponsored the bill introduced March 10.
The National Conference of State Legislatures has estimated that states are losing more than $23 billion per year in uncollected sales taxes on online purchases.