LINK Written by Susan Jones, CNSNews.com Senior Editor Former Sen. Fred Thompson of Tennessee -- the not-quite-yet Republican presidential candidate -- says the next president "should enact a fundamental overhaul of the tax code that makes it fairer, simpler, and more pro-growth." Thompson mentioned that there are a "number of ways to do that," and he said the "principles and ideas found in the Fair Tax are a good place to start." The Fair Tax -- a national retail sales tax designed to replace the income tax system and all payroll taxes -- has the support of five declared Republican presidential candidates and one Democrat (former Sen. Mike Gravel). Thompson, in an Aug. 10 letter to the national FairTax campaign, said it's time for Congress to begin "a serious consideration of real fundamental tax reform rather than nibbling around the edges." FairTax said it welcomes the support of Republicans like Thompson as well as that of Democrats, Independents, and Americans who have given up on political parties. "Wresting control of the tax system away from an army of Washington, D.C., tax lobbyists requires the kind of grassroots wildfire the FairTax campaign is producing," said Ken Hoagland of FairTax.org. "Public response has been so strong and so broad we believe this campaign is now on the verge of becoming a powerful national movement," Hoagland added. Americans for Fair Taxation, or FairTax for short, says it wants to make tax reform the main issue in the 2008 presidential election. The group says a national sales tax, or consumption tax, would be self-limiting and enhance civil liberties, while direct taxes (such as the income tax) has been a tool of tyranny throughout history.