I think I probably didn't explain it well. What you typed above probably is closer to what the quote-unquote "experts" ;-) say. I try to back up everything with a source, but I only have a few minutes to type right now. I'll try to search for a source later.
Today there are burgeoning domestic constituencies in numerous countries who favour lower tariffs because their livelihoods depend on access to imported raw materials, components, and capital equipment.... That dynamic is easier to appreciate when one considers that 55% of all US import value in 2007 consisted of raw materials, intermediate goods and capital equipment the kinds of products the construction and manufacturing sectors purchase. Put in this light, it is more obvious that tariffs raise the costs of production, which undermines economic growth or, as in the current case, economic recovery.