Republican Arizona Secretary of State Ken Bennett tops the field in the first poll gauging the 2014 gubernatorial race.

A poll of 600 registered voters, done by Susquehanna Polling and Research the first week of December showed Bennett leading the six-way Republican field with 20 percent support.

State Treasurer Doug Ducey was second at 8 percent, followed by Mesa Mayor Scott Smith at 6 percent. Christine Jones, former Go Daddy executive vice president, and Andrew Thomas, former Maricopa County attorney, both had 4 percent. State Sen. Al Melvin of Saddlebrooke north of Tucson had 2 percent.

The poll showed 53 percent of Arizona voters were still undecided.

"Given the high undecided, it's still way too early to predict a victory for anyone," said Jim Lee, president of Susquehanna Polling and Research.

Lee said Bennett's support from the Mormon community and state Tea Party could weigh more than the business support other candidates are getting.

Regardless of who wins the primary, two potential match-ups of GOP candidates against presumptive Democratic nominee Fred DuVal shows both Bennett and Ducey with small leads over DuVal, the poll showed.

The poll of registered voters has a margin of error of plus or minus 4 percentage points, Susquehanna Polling said.