MASON CITY, Iowa - Politicians keep looking for signs of erosion in John Edwards' make-or-break campaign to win the Iowa caucuses.
And not finding any - at least not so far.
Despite the widespread view that the national Democratic race for president has become a two-candidate affair, number three keeps hanging on out here in the Midwest.
Poll after poll shows the former North Carolina senator with the support of more than 20 percent of Iowa prospective caucusgoers, very much within range of Sens. Hillary Rodham Clinton and Barack Obama, and well ahead of everyone else.
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