The claim that you can keep your plan and doctor was the line that sold Obamacare to a skeptical public, and gave Democrats cover to rework the health care system, comprising 1/5 of the economy, by a bare majority in Congress.

That false promise generally is attributed to Obama during the 2009-2010 push to pass Obamacare:

Even left-leaning Politifact termed the claim the Lie of the Year.

But Hillary got there first.

This 2007 video shows Hillary making that promise as to Hillary’s healthcare reform proposal which was similar to what became Obamacare. Hillary supported Obamacare and still does.

During the 2008 presidential campaign Hillary used that line (via Keith Appell Twitter)

It was the lie that is devastating our healthcare system, and Hillary got there first.