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Republican presidential candidates (L-R) former U.S. Senator Rick Santorum (R-PA), former Massachusetts Governor Mitt Romney, former House Speaker Newt Gingrich and U.S. Rep. Ron Paul (R-TX)

US Election 2012: What's Happened to the Republican Party?

What on earth has happened to the Republican Party, the party of Abraham Lincoln, Teddy Roosevelt and Ronald Reagan? Since the departure of George W. Bush the party seems to have become the preserve of mediocrity at best and crankery at worst.