By Ben Geman - 05/07/13 03:35 PM EDT
Steyer spent heavily to attack Markey’s primary opponent, Rep. Stephen Lynch (D-Mass.), because Lynch backs the proposed Keystone XL oil sands pipeline. Markey criticized Steyer’s actions and had urged him not to get involved.
In the primary, a number of local environmental activists had asked him to get involved in the race, and an aide indicated Steyer will wait for a similar request before he engages in the general election.
Steyer spent $630,000 on the primary race.
The most recent poll of the general election fight, though early, indicates Markey may be able to use Steyer's help — it showed him ahead of Republican Gabriel Gomez by only four percentage points.
The Californian made his fortune in the hedge fund industry.
Steyer stepped down last year from Farallon Capital Management, a fund he founded, to focus on his work on climate and green energy.
--This piece was updated at 2:18 p.m.