The Vermont senator preaches a bracing populist message that's likely to thrill millions of voters on the left, the ones who sometimes dub themselves "the democratic wing of the
"There is something profoundly wrong when the top one-tenth of 1% owns almost as much wealth as the bottom 90%," Sanders said at a raucous lakefront rally in Vermont. "This type of rigged economy is not what America is supposed to be about."
He said he hopes to "begin a political revolution to transform our country economically, politically, socially and environmentally." And he has a detailed program to do it.
Sanders wants to raise taxes on the rich not only to limit the flow of income to the upper crust but also to redistribute some of their accumulated wealth. He wants to impose a federal sales tax on stock trades and other financial transactions to pay for free tuition at every public college. He wants to open Medicare to everyone, young or old, creating a European-style single-payer healthcare system. He wants to break up big banks, clamp more regulation on Wall Street and outlaw massive donations to political campaigns.
Even without a full-blown national campaign, those ideas have been enough to vault Sanders into second place in surveys of Democrats in early primary states. Well, perhaps "vault" is an overstatement: He draws 15% in Iowa and 18% in New Hampshire, still far behind Clinton's 60% or so.
Here's the key to those poll numbers: Sanders is winning almost exactly the same levels of support that Sen. Elizabeth Warren (D-Mass.) drew in early surveys. Now that she's made it clear she isn't running, pollsters are leaving her name off, and Sanders appears to be inheriting her support.
The Vermont socialist, who once chafed at comparisons with his progressive colleague, now readily embraces the role of her stand-in.
"I think our views are parallel on many, many issues," he told a reporter this week.
So why is this challenge good for Clinton?
First, as Sanders himself acknowledges, he's "a major underdog"; he's not likely to win.
Second, until now most of the media coverage of Clinton's campaign has focused on secret emails, entanglements with uranium moguls and outlandish speaking fees. If Sanders forces a robust debate on issues such as healthcare, taxes and trade, the media will have to pay attention to that instead. Sanders' entry into the race will allow Clinton, who has already veered left, to call for vaguely similar policies and still say: "He's a socialist; I'm not."
On a superficial level, moreover, Sanders' presence on the stage will make Clinton, 67, seem relatively young. Sanders is 73; if he won the presidency, he'd be 75 at his inauguration, more than five years older than Ronald Reagan in 1981.
Finally, Sanders will give voters a reason to watch the Democratic debates — and maybe even get excited about the party's ideas, an emotion that's been missing until now.
"There are signs that Democratic voters are demoralized," Andrew Kohut, a pollster at the independent Pew Research Center, told me. "If that persists, it can depress their turnout on election day."
A recent Pew poll, for example, found that only 58% of Democrats said they had given a lot of thought to the presidential campaign, down from 71% eight years ago.
Meanwhile, the Ipsos polling organization projected that voter turnout next year could drop to 50%, down from 55% in 2012 — a trend that's especially bad for Democrats, since Republicans turn out more reliably.
A Sanders campaign won't be all sweetness for Clinton, to be sure. He isn't a forgiving soul; he has already come close to calling the likely nominee a plutocrat.
"It's not just the Clintons," he told CNBC last week. "When you hustle money like that … you sit in restaurants where you're spending — I don't know what they spend — hundreds of dollars for dinner and so forth. That's the world that you're accustomed to, and that's the worldview that you adopt."
But Clinton already knew she had that vulnerability, and so did her voters; it's already reflected in her poll numbers.
At this stage, Sanders can't beat Clinton; only Hillary and Bill Clinton can beat Hillary Clinton — in the form of new problems with emails or finances or other peccadilloes as yet undiscovered.