Democrats need to walk a fine line between being too aggressive and overly passive when defending or advocating for Democratic nominee Hillary Clinton, President Obama told attendees at a Hillary Victory Fund dinner in Chilmark, Mass., Monday night.

"If we are not running scared until the day after the election, we are going to be making a grave mistake," Obama told the 60 guests at the fundraiser, hosted by Hank and Carol Goldberg.

Obama said Democrats have a habit of jumping between "freak-out mode and complacency" during elections, but must find a middle ground that doesn't hurt the party's reputation yet earns them the Oval Office come November.

"We are still going to have to fight what has been an unrelenting negative campaign against her that has made a dent in the opinion of people even who are inclined to vote for her," Obama said about Clinton's critics. The president took time out of his two-week getaway to Martha's Vineyard to campaign for Clinton.

Obama told guests the election is still unpredictable and employed liberals and progressives to unite and fully invest themselves in Clinton's campaign over the next 80 days.

The dinner came with a $10,000 donation cost, which will go toward HVC, a joint fundraising committee that unifies Clinton's campaign committee, the Democratic National Committee and state parties across the country.

Clinton rallied with Vice President Joe Biden in his hometown of Scranton, Pa., earlier Monday.