The latest Reuters/C-SPAN/Zogby tracking poll in Iowa shows Sen. Hillary Clinton maintaining a four-point lead in the Democratic presidential race, trailed by Sen. Barack Obama at 26%, and John Edwards at 25%.
Meanwhile, Edwards remains the second choice of 30% of Democrats, with Obama at 22% and Clinton at 15%. This could help him on caucus night when non-viable candidates are dropped from consideration.
On the Republican side, Mike Huckabee widened his lead over Mitt Romney, 29% to 25%, with Sen. John McCain back at 12% and Fred Thompson at 10%.
Each poll has a 3.5% margin of error, making both races statistical ties.