From Business Finance:

Conversely, a survey by the R Street Institute and the National Taxpayers Union (again, not unbiased groups), also conducted in July, found 57 percent of likely national voters opposed the following: Online retailers must collect and process sales tax on purchases made over the Internet ONLY in states where that retailer has a physical presence. For larger companies like Target or Wal-Mart, this may be all states. However, many small online retailers who only have a presence in one state are exempt from collecting sales taxes from customers in other states. Congress is proposing to change the law – giving states the authority to force all online retailers to collect sales taxes from customers in that state—even if the retailer has no physical presence there. Knowing this, would you favor or oppose new legislation that changes the system for how states collect sales taxes from Internet purchases?

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