Washington (CNN) Whatever New Hampshire saw in Donald Trump, it looks like Iowa is seeing it too.

Wisconsin Gov. Scott Walker continues to lead the Republican field in the Hawkeye state with 18%, while Ben Carson tied with Trump for second. Walker has yet to announce he is running for president, but is expected to launch his campaign this month.

While Walker sits eight points ahead of the field, the rest of the fray of Republican White House hopefuls is tightly packed within the poll's margin of error. Just one point behind Carson and Trump lie Sens. Rand Paul of Kentucky and Ted Cruz of Texas. Floridians Jeb Bush, the state's former governor, and Marco Rubio, a senator, trail closely with 8% and 7%, respectively.