Sanders on Brexit, what it would take for him...

Sanders on Brexit, what it would take for him to endorse Clinton

Sanders on Brexit, what it would take for him to endorse Clinton

Democratic unity appears to be on the horizon.

Presumptive Democratic nominee Hillary Clinton is in talks with primary rival Bernie Sanders for a joint campaign appearance, a source confirmed to CBS News. The source said that event could come as early as Tuesday in New Hampshire, though no final decisions have been made.

Clinton officially clinched the nomination back in early June, capping it off with a bigger-than-expected victory in the June 7 California primary. At the time, Sanders vowed he would continue his fight to the convention; since then, he has slowly shifted his language to suggest he will back Clinton.

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In late June, for example, Sanders told "CBS This Morning" that he hadn't endorsed Clinton yet because he had "not heard her say the things that I think need to be said." Sanders and Clinton met in June, with Sanders pushing for Clinton to adopt his policies on issues like the federal minimum wage, the Trans-Pacific Partnership trade deal and college affordability. Still, he said he planned to vote for Clinton in November--and in a separate interview conceded that "it doesn't appear that I'm going to be the nominee."

On Wednesday, Clinton indicated with the rollout of a new college affordability plan that she's planning to take Sanders' influence into account on some policy issues. The proposal will make public college tuition-free for families that make less than $125,000 per year.

CBS News' Nancy Cordes contributed to this story.