Despite his extreme political views on rape, contraception and homosexuality, the Catholic hawk is the one Republican hopeful who could yet defeat Mitt Romney on Super Tuesday

Few American presidential campaigns have ever adopted a totem as unlikely as the sweater vest. But Rick Santorum, the far-right social conservative now topping national polls in the Republican presidential nomination race, has embraced the unfashionable, dorky item of sleeveless knitwear with a fervour his religious-minded supporters must appreciate.

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