From NASCO's own website:
"North Americas SuperCorridor Coalition, Inc., is a non-profit organization dedicated to developing the worlds first international, integrated and secure, multi-modal transportation system along the International Mid-Continent Trade and Transportation Corridor to improve both the trade competitiveness and quality of life in North America. We were founded in 1994 as the I-35 Corridor Coalition and in 1996 incorporated into a non-profit organization and became NASCO.
NASCO is not a government agency. We have no authority to build or develop anything unilaterally. NASCO will work with our members, state Departments of Transportation and federal and local agencies involved in transportation, trade and security to accomplish our mission."
http://www.nascocorridor.com/pages/about/about.htm
"SuperCorridor & NAFTA Highway Defined
SuperCorridor - not "Super-sized". As defined in Webster's dictionary, "Super" means "more inclusive than a specialized category". NASCO uses the term "SuperCorridor" to demonstrate we are more than just a highway coalition. NASCO works to develop key relationships along the EXISTING corridors we represent to maximize economic development opportunities along the NASCO Corridor, as well as coordinate the development of technology integration projects, inland ports, environmental initiatives, university research, and the sharing of "best practices". NASCO is particularly focused on coordinating the efforts of local, state and federal agencies and the private sector to integrate and secure a multimodal transportation system along the existing "NASCO Corridor."
"NAFTA Superhighway" - As of late, there has been much media attention given to the "new, proposed NAFTA Superhighway". NASCO and the cities, counties, states and provinces along our existing Interstate Highways 35/29/94 (the NASCO Corridor) have been referring to I-35 as the 'NAFTA Superhighway' for many years, as I-35 already carries a substantial amount of international trade with Mexico, the United States and Canada. There are no plans to build a new NAFTA Superhighway - it exists today as I-35."
Eagle Forum is making things up.