"He's not saying no," one adviser said. "This is his time to figure it out."
Among the potential moves are efforts to restart a moribund fundraising operation, launch a new political action committee, and find a way to channel the energies of a "Draft Biden" movement that's now not being led by Biden insiders.
One adviser said the new actions would roll out over the next 30 to 45 days, roughly tracking Biden's statement that he would decide on running by the end of the summer.
On Saturday, New York Times opinion columnist Maureen Dowd reported that Biden has been "talking to friends, family and donors about jumping in."
"The 72-year-old vice president has been having meetings at his Washington residence to explore the idea of taking on Hillary in Iowa and New Hampshire," Dowd wrote.
On May 30, Biden’s son, Beau, died of brain cancer at the age of 46, ushering in a period of mourning for the vice president and his family.
Harpootlian said that while he has not had a direct conversation about running with the vice president or his formal advisers, the pace of political operations is picking up.
"This isn't some snap decision. He really is weighing how this would impact his family. How crazy is that?" he said.
The vice president and his team know they need to move fairly quickly if he's going to run against Clinton, Harpootlian said.
"My sense around the country is there's tremendous support there. He's got to gauge that. And then he's got to do a gut check," he said.
However, the poll also found that less than half -- 42 percent -- of Clinton’s supporters describe themselves as "very enthusiastic." Seventy-two percent of Democrats and Democratic-leaning independents said they are satisfied with their choice of candidates, potentially leaving some wiggle room for Biden.
When ABC’s George Stephanopoulos interviewed Biden on "Good Morning America" in January, he said "there's a chance" that he would challenge Clinton, but added, "I don’t think I have to make up my mind until the summer."
In the interview he said he considered the presidential contest "wide open on both sides."