The donors are trying to stoke that opposition.

Betsy Taylor, a climate activist who worked for Obama’s election and then was arrested outside the White House protesting the pipeline, said the group of about 100 Democratic contributors and activists, including Buell, aims to show Obama “if he does the right thing, he is going to get so much love.”

“People are giving it everything they can,” said Taylor, who is helping to organize the donors. “This is a line-in-the- sand kind of decision.”

Steyer’s NextGen Committee super-PAC has raised $750,000 and spent more than $500,000, according to Federal Election Commission data. Among the races it has targeted is an April 30 Democratic primary for an open U.S. Senate seat in Massachusetts that pits Representative Ed Markey, a Keystone opponent, against Representative Stephen Lynch, who has been supportive.

“We’ve got to step up our game and make our case -- it’s not going to make itself,” said David desJardins, a philanthropist and former Google Inc. software engineer who attended the fundraiser at Steyer’s house.

One former Obama donor has shifted from insider to activist.

Guy Saperstein, a California venture capitalist and onetime president of the Sierra Club Foundation, said while he gave to Obama’s campaign in 2008, he became disillusioned. Rather than attend the fundraiser at Steyer’s house, Saperstein chose to join Keystone protesters camped out nearby.

“The indications I got back from the people who were inside suggested that he was not very persuadable, but you know politics is a funny thing,” Saperstein said. “If people are in the streets, being loud and making the case, things can change.”

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