(CNN) - A new poll released Thursday indicates Mitt Romney's favorability rating dropped slightly in the past month.
According to the Pew Research Center survey, 37% of respondents said they hold a favorable view of the presumptive GOP nominee, compared to 41% in June.
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In its findings, Pew noted that July marked the sixth consecutive month in a row in which more people held an unfavorable view of Romney than a favorable view.
The poll shows that the former Massachusetts governor's rating significantly improved between March and June, when other GOP contenders dropped out of the race and the Republican base united around Romney.
Since then, however, the candidate has struggled to maintain his image, according to the poll, as he battles head-to-head against President Barack Obama's fully-loaded re-election campaign.
Team Obama and national Democrats have hammered Romney this summer over his business background in attacks that include tying him to outsourcing, questioning his financial portfolio and accusing him of being misleading about his departure date as CEO of Bain Capital.
The survey was mostly conducted before Romney took an overseas trip at the end of July. During his three-country tour, he faced criticism for making comments in the United Kingdom and Israel that some groups found offensive.
On the flip side, 50% of voters–the same amount as March–say they hold a favorable view of Obama, while 45% have an unfavorable view.
"Even so, Obama's personal ratings are lower than most presidential candidates in recent elections," the study notes.
The Pew Research Center for the People & the Press conducted the survey between July 16 and 26, questioning 2,508 adults, including 1,956 registered voters.
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