BOSTON -- Democrat Shannon O'Brien and Republican Mitt Romney were deadlocked in the race for governor, according to a Boston Herald poll released Friday.

O'Brien received 43 percent support to Romney's 42 percent, within the poll's margin of error of 4.9 percent. Eleven percent of the 407 likely voters questioned said they remained undecided with one month to go before the Nov. 5 general election.

"We don't see any major change in the overall dynamics of the race," said R. Kelly Myers, director of RKM Research and Communications, which conducted the poll Wednesday and Thursday. "The race continues to be extremely tight."

A Boston Globe/WBZ-TV poll conducted a week earlier had found O'Brien with a narrow lead over Romney: 42 percent to 36 percent with a margin of error of 5 percent.

The new poll found both candidates' favorability rating had dropped in the past two weeks.

O'Brien was viewed favorably by 51 percent of voters, with 30 percent giving her an unfavorable mark. That was compared to a 60-23 margin in the earlier poll.

Romney's favorability ratings fell to 47 percent from 57 percent, with 36 percent viewing him unfavorably now compared to 29 percent two weeks ago.

O'Brien continued to lead Romney among female voters, 48-37 percent, while Romney held a 46-33 percent advantage among independent voters.

Thirty-eight percent of those polled had watched Tuesday's televised debate, the second between the candidates.

Thirty-nine percent believed O'Brien won the debate, compared to 28 percent for Romney and 26 percent calling it a tie. But Romney was favored by 48 percent of voters who watched the debate, compared to 43 for O'Brien.

The candidates are scheduled to debate three more times before the election, including two debates that will include all five candidates for governor.

That may offer a boost to Green Party candidate Jill Stein and Libertarian Party candidate Carla Howell, who received 2 percent and 1 percent support respectively. (AP)