WASHINGTON — Attorneys, business owners and retirees were among those who helped President Barack Obama maintain slim fundraising supremacy over Republican challenger Mitt Romney last month, with the president raising $181 million as he entered the last full month in the fight to keep his job.

An AP review of newly released financial reports found at least $11 million from lawyers and at least $3 million from investors and bankers, some of whom cooled to the president earlier when critics say he cracked down on Wall Street and pushed for consumer-protection reforms. About $22 million more came from retired Americans.

Their contributions, among hundreds of thousands, went hand-in-hand with record donations to an outside political group helping Obama win a second term. Still, the president began October with less available money to spend than Romney, as Obama’s campaign, the Democratic Party and related groups reported $149.8 million cash on hand. That’s compared with $183.1 million in the bank among Romney’s campaign, the GOP and his joint-fundraising apparatus.

A swath of small-dollar contributions helped Obama and the Democratic Party best Romney and the GOP by more than $10 million last month after being repeatedly walloped in the money race earlier this year.