The Senate’s only self-proclaimed socialist said Wednesday he is nearing a decision on a run for the White House.

Sanders said he is trying to determine whether he can raise the copious amounts of money needed to win the presidency and run a “credible campaign” that tackles income inequality, unemployment, trade and climate change.

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Running a bad campaign would sabotage his chance to hammer home the issues, and create uninterested voters and leave them behind, he said on a call with Democracy for America.

“It has to be done well,” he said.

He asked supporters on the call whether they are “prepared to get actively involved in this campaign by taking on the most powerful people in the country and the world.”

He said door-knocks and a grassroots effort would help tip the scales into his favor without needing the $1 billion spent by President Obama and Republican candidate Mitt Romney in 2012.

“It’s not about me, it’s about running a campaign with the support of the American people,” he said.

Sanders also said he is continuing his efforts to stop trade promotion authority legislation from gaining approval in Congress.

He urged participants on the call to put more pressure on lawmakers to oppose a bill, which has yet to emerge.

“We can turn some of these guys who are wavering around if they know the American people are aware of what’s happening,” he said.

But Sanders said he wasn’t sure whether there was enough opposition in the Senate to stop a fast-track bill.

“Whether we can beat it in the Senate or not, I don’t know; I think we have a better shot, frankly, in the House, where to the best of my knowledge, the overwhelming number of Democrats are against it,” he said.

Senate Finance Committee Chairman Orrin Hatch (R-Utah) and Sen. Ron Wyden (D-Ore.) are still working toward compromise legislation.

A fast-track bill would smooth passage of the 12-nation Trans-Pacific Partnership and any other trade deals that reach Capitol Hill.

The Finance panel has scheduled a Thursday hearing on trade with Treasury Secretary Jack Lew, U.S. Trade Representative Michael Froman and Agriculture Secretary Tom Vilsack.

“I don’t think any of us are against the concept of trade,” Sanders said, referring to Democratic lawmakers attending a rally Wednesday on Capitol Hill. “Trade is a good thing. But we need trade agreements that work for the middle class and working families, not just for the CEOs of multinational corporations.”