Trump, Cruz and Rubio top Republican polls; Clinton and Sanders tied for Democrats
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READ MORETwo natural gas and two finance sector billionaires give Cruz $35 million
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READ MOREAs primaries near the campaigns get serious, insider worry about intensifying attacks
READ MOREA look at some of the claims and how they compare with the facts
READ MOREWith polls showing race tight in Iowa Clinton challenges Sanders record
READ MOREIt's about paying poor workers less just as much as paying more to those at top
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