The latest CBS News Battleground tracking poll shows Donald Trump leading in all three early states.
Iowa: Trump 29%, Carson 25%, Cruz 10%, Rubio 6%, Walker 5%
New Hampshire: Trump 40%, Carson 12%, Kasich 9%, Fiorina 8%, Paul 6%, Bush 6%
South Carolina: Trump 36%, Carson 21%, Cruz 6%, Bush 5%, Graham 5%
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