(CNN) - New polls that were taken partially after the second presidential debate indicate President Barack Obama has an edge over Republican challenger Mitt Romney in the battleground states of Wisconsin and Iowa.
Fifty-one percent of likely voters in Wisconsin back the president, while 45% support Romney, according to one of the NBC News/Wall Street Journal/Marist polls released Thursday. The six point margin falls within the survey's sampling error, meaning the two candidates are statistically tied in the state.
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In Iowa, however, Obama has an eight point lead over Romney, 51%-43%. Both surveys were conducted Monday through Wednesday, with about half of respondents interviewed after the second presidential debate on Tuesday, the surveys say.
Iowa and Wisconsin are rated as "toss-up" states on CNN's Electoral Map.
The NBC/WSJ/Marist results offer a contrast to previous polls released after the first debate, which showed Romney with a bounce in several swing states.
A Marquette University Law School poll, for example, released Wednesday showed Obama ahead by only one point in Wisconsin, though the survey was conducted entirely before the second presidential debate. And in Iowa, an American Research Group survey released on Monday showed Obama and Romney tied at 48% in the Hawkeye State.
The NBC/WSJ/Marist poll shows that Obama seems to have a strong lead over Romney among early voters in Iowa. About a third of likely voters said they have already cast their votes in the state, and 67% of them said they supported Obama, while 32% said they backed Romney.
The president has made an aggressive push in the state. He appeared in Iowa Wednesday, and former President Bill Clinton, as well as rock legend Bruce Springsteen, stumped in the state for Obama on Thursday.
Romney, however, has stronger numbers on the question of enthusiasm. In Wisconsin, 68% of Romney fans showed a "high level" of enthusiasm, while 63% said the same about Obama. In Iowa, which has six electoral votes, the gap is wider, with 64% of Romney supporters showing enthusiasm, compared to 53% for the president.
In recent weeks, Republicans have upped their efforts in Wisconsin, hoping to grab its 10 electoral votes. The pro-Romney super PAC, Restore Our Future, has especially gone after the state, dropping millions in ad money the last few weeks. Wisconsin also represents the home state of Romney's running mate, Rep. Paul Ryan.
In Iowa, 1,137 likely voters were questioned by telephone for the survey, which has a sampling error of plus or minus 2.9 percentage points. In Wisconsin, 1,013 likely voters were surveyed, with a sampling error of plus or minus 3.1 percentage points. Both surveys were conducted between October 15 and October 17.