Romney and Santorum collide in Michigan primary (AP)

[unable to retrieve full-text content]AP - Republican rivals Mitt Romney and Rick Santorum collided Tuesday in a rancorous Michigan presidential primary that tested the clout of the GOP establishment against conservative and tea party rebels as well as the candidates themselves.

Source: http://us.rd.yahoo.com/dailynews/rss/gop/*http%3A//news.yahoo.com/s/ap/20120229/ap_on_el_pr/us_gop_campaign

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