And that may be just the way the Clinton campaign wants it. It's not clear how much Sanders can help her right now.

The Vermont senator will make his first post-convention campaign pitch for Clinton on Monday in New Hampshire, where he'll be, according to the Clinton campaign, discussing her "plan to build an economy that works for everyone."

Perhaps in a normal election year, deploying a popular liberal New England politician to a swing state he'd won overwhelmingly during the primary season would be a smart move on Clinton's part. But this is no normal election year: Clinton is already up by double digits over Trump in New Hampshire, according to a recent WBUR poll.

Okay, so maybe New Hampshire isn't in play. But if Sanders has any leverage, it could be to persuade his supporters skeptical of Clinton to get on board with her. Remember those Sanders supporters who shouted and/or turned their backs on her and her supporters at the Democratic National Convention in July? Sanders could help Clinton win over those people, right?

Not really. t turns out Clinton is doing just fine with liberal Democrats.

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In New Hampshire, that same WMUR poll shows 84 percent of Democrats said they'd vote for Clinton, with just 2 percent saying they'll be voting for Jill Stein, the Green Party nominee who is trying to court Sanders voters.

Nationally, Clinton is holding together the party just as well as any other recent nominee. In an August Washington Post-ABC News poll, 82 percent of liberals said they think Clinton is qualified to serve as president. The poll also found 62 percent of liberals said they think she is honest and trustworthy, one of the higher numbers she has scored on that question, which is one of her biggest challenges this election.

Of course, there's always a caveat: In another Post-ABC News poll, Clinton's favorability rating dipped among liberals, from 76 to 63 percent. But that may be a function of Clinton's likeability dropping across the board. In that poll, she also lost points with Hispanics and women, both of whom solidly support her over Donald Trump — even as a record number of Americans now dislike the Democratic nominee.

Given how far-reaching her likeability problem seems to be, there's probably not much Sanders can do to reverse that trend.

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Now, there is one stop where Sanders might be able to do Clinton some good — but it's a lot further from home than Monday's rally, which is being held just a quick drive from the Vermont border. He could give Clinton a boost in Iowa.

That's one of the few swing states where the race between Clinton and Trump is too close to call at the moment — in part, as my colleague Philip Bump points out, because of some serious Sanders holdouts.

A recent Suffolk University poll found that a quarter of Iowa voters who caucused for Sanders in the presidential campaign are undecided about whether to support Clinton or Trump. So are 32 percent of people age 18 to 34. (Younger Democrats tended to skew toward Sanders.)

So if Sanders were willing to really commit himself to singing Clinton's praises in Iowa, he could probably help her out there with Democratic holdouts.

But Clinton doesn't necessarily need to win Iowa to win the presidency. If Trump won Iowa and its six electoral votes, along with every state Mitt Romney won in 2012 (most definitely not a guarantee for Trump at the moment), she would still claim victory in November.

(Courtesy of our electoral map tool.)

All this is to say it's definitely better for Clinton to have Sanders on board than actively rooting against her. But she doesn't necessarily need his active support nearly as much as it might have seemed just a few months ago.