Fifty-five percent of those polled say the first-term Democratic senator is doing a good job, a slight increase from the 52 percent who thought so in September.
The well-known former comedian and satirist had one of the nation's closest, most controversial Senate races in 2008, winning by only a few hundred votes statewide over former U.S. Sen. Norm Coleman. Since then, he has won over Democrats such as Michael McQuillan, 61, of St. Paul.
"He isn't the personality he was when he was on TV," McQuillan said. "He's a serious politician. He isn't doing any grandstanding. He's actually just doing the job."
Less than a third of poll respondents disapproved of Franken's job performance, while 16 percent are unsure.
"He ought to go back to writing jokes," said Lynette Jones, 65, a Lake Crystal Republican. "He has no idea what he's doing in Congress."
Jones cited Franken's refusal to restrict federal funding for abortions and his support of President Obama's Affordable Care Act as proof that he is out of touch with rural, conservative-leaning Minnesotans. "He just doesn't represent our views," she said.
Matt Burgess, campaign manager for Franken's re-election effort, said, "The numbers show that people see him working really hard on their behalf. Senator Franken's going to continue to work hard."
The poll interviewed 800 Minnesota adults June 11-13, by land-line and cellphones, and has a margin of sampling error of 3.5 percentage points, plus or minus.