Former Clinton aide Lanny Davis makes a similar case in the Wall Street Journal:

Somehow, in the last 12 months, we allowed the party of Bill Clinton and Barack Obama to morph into the party of George McGovern (or more accurately, his most ardent supporters) and Howard Dean, who called for the defeat of the Democratic health-care bill if it had neither a public option or Medicare buy-in. (He couldn’t possibly have been speaking for the 31 million uninsured people in taking that all-or-nothing position.)

In 1996, Mr. Clinton was the first Democrat to win re-election since FDR—expanding the electoral map once again into western, southern, and sunbelt states. He did so by creating a new ideological hybrid for a still-progressive Democratic Party: balanced-budget fiscal conservatism, cultural moderation, and liberal social programs administered by a “lean and mean government.” This New Democrat combination appealed to Ross Perot independents concerned about deficits, and also to traditional Republican suburbanites who were culturally moderate on issues like abortion and gay rights but opposed to high taxes and wasteful, big-government bureaucracy.

Then, in 2008, Barack Obama added something extra: a commitment to a “new politics” that transcended the “red” versus “blue” partisan divide. He explained this concept clearly in his 2004 Democratic Convention keynote speech and during his 2008 presidential campaign. It meant compromise, consensus and bipartisanship, even if that meant only incremental change. The purists on the left of the Democratic Party who demanded the “public option” or no bill at all apparently forgot that candidate Obama’s health-care proposal did not include a public option; nor did it include a government mandate for everyone to either purchase insurance or pay a significant tax approximating the cost of that insurance—the “pay or play provision” in both the Senate and House bills.

Somehow?  Look very carefully for the one name Davis neglects to mention: Nancy Pelosi.  There isn’t any somehow about this.  Obama abdicated his agenda to Pelosi, either because he secretly supported a far-Left agenda or couldn’t be bothered to make up his own mind about what he wanted.  The outcome was entirely predictable.