What world are you living in? There has been no deindustrialization - the US manufactures more than it ever did in the past.
The primary opponents of free trade in labor are conservatives (the laborers likely to be imported are likely to vote against them). Republicans don't generally favor protectionism for industries full of unionized Democrats who vote and mobilize against them. That's not the same thing as opposing protectionism.
Bush was a protectionist, as was Romney, according to both their supporters and detractors.
The primary opponents of free trade in labor are conservatives (the laborers likely to be imported are likely to vote against them). Republicans don't generally favor protectionism for industries full of unionized Democrats who vote and mobilize against them. That's not the same thing as opposing protectionism.
Bush was a protectionist, as was Romney, according to both their supporters and detractors.
http://buchanan.org/blog/pjb-george-bush-protectionist-1332
http://mises.org/freemarket_detail.aspx?control=463
http://online.wsj.com/news/articles/SB1000087239639044470900...
The rule is, unfortunately, not a principled for/against protectionism on either side of the aisle. The rule is simply cronyism - protect your allies.