Because she's running. You may not think she's running and she may protest she's not running.... yet. Whatever. What's evident is that the public has its reasons for liking her less and less.
Okay: she's got Bill. Doesn't that help?
On the face of things, having a popular former President by her side is a great opportunity. After Bill Clinton left the Oval Office, he could be relied upon to rally the Democratic base, especially minorities. Today, his popularity extends to independents and even some Republicans. In the past year or two, his approval rating has consistently been in the mid or high sixties, which means he’s a lot more popular now than he was for most of his two terms in office. His ratings are also a good deal higher than Hillary’s. A new NBC/Wall Street Journal survey puts her approval rating at just forty-three per cent, which represents a steep fall from her figures a couple of years ago. ...JohnCassidy,NewYorker
Whew! That's kind of embarrassing.
Of course, it’s not clear how much of a boost the former President can give his wife. If he plays an active role in her campaign, his image as an elder statesman may be tarnished, in which case his own approval rating would fall. Something like this appears to be what has happened to Hillary. A couple of years back, she was a hardworking Secretary of State, flying all around the world representing the United States and, seemingly, above the daily Washington squabbles. Now many Americans see her as another partisan politician, and her popularity has suffered accordingly. ...JohnCassidy,NewYorker
Cassidy goes on to make an argument for a Hillary win. It has to do with economic numbers over the past several years.
In fighting a deep recession with Keynesian stimulus policies, raising tax rates on the rich, boosting the minimum wage, and seeking to provide health care for all, the Obama Administration was pursuing a mainstream progressive agenda that virtually all Democrats support, and, to a large extent, it has worked as advertised. Moreover, much of this agenda can be traced to the Administration of Bill Clinton. In the case of universal health coverage, the lineage can be traced back to Hillary herself.
No surprises there, then. Still, it was helpful of Hillary, at this early stage, to make things clear: her 2016 campaign will rise or fall on defending the economic record of the past six years. ...JohnCassidy,NewYorker
A commentator at Bloomberg thinks that from now on, it's all (snore) Hillary.
It's hard to believe the historically fractious and occasionally thrill-seeking — the nomination of Barack Hussein Obama was the political equivalent of magical realism — Democratic Party will surrender in toto to Clinton without at least a symbolic fight. But with each passing day, it gets even harder to believe it won't. ...FrancisWilkinson,Bloomberg