Having agreed with him on most issues so far in her 2016 race, Clinton edged to Obama's left on climate change yesterday.
In the course of a few hours, she announced her disapproval of his move to allow Royal Dutch Shell to drill in the Arctic Ocean and her impatience for a decision on the Keystone XL pipeline Alberta in Canada to Texas.
Then as she took questions from reporters later in Nevada, she said the US should be focusing on cleaner sources of renewable energy, rather than risking "potential catastrophes" in the search for more oil.
"I think the very great difficulties that Shell encountered the last time they tried to do that should be a red flag for anybody," Clinton said, referring to a setback that beset the oil giant when it tried to drill there in 2012, including a rig that ran aground.
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Her biggest rebuff came in June when she declined to support giving Obama expedited negotiating authority on trade. Even then, she characterized her position as more of a wait-and-see approach than outright opposition to the trade deals he's pursuing.
One of Clinton's challenges is winning enough support in the liberal wing of the Democratic Party. Her primary opponents like Vermont Sen Bernie Sanders are opposed to Keystone, Arctic drilling and other projects deemed risky for the environment. And in recent weeks, Clinton has suggested that she could be more effective than Obama in working with Republicans to get things done.