It's not hard to see why they would be. Keeping your hopes up on a losing political campaign is a bit like playing Jenga. As more and more pieces get knocked out, it's harder and harder to keep upright. Those pieces can be varied: poor fundraising numbers, gaffes, hard-hitting ads from opponents. They can also be poll numbers -- like these new state polls that knock some significant blocks out of Trump's tower.

In New Hampshire, a survey from WBUR shows Hillary Clinton leading Trump by 17 points. In Pennsylvania, a Franklin & Marshall College poll has Clinton up 11 among likely voters. In Michigan, a Detroit News poll shows Clinton up 6 points in a head-to-head match-up.

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Update: At noon, Suffolk University released a new Florida poll. There, Clinton leads by 6 points. Details from that survey are at the bottom of this article.

The New Hampshire and Pennsylvania surveys break out how various demographics feel about the candidates. As usual, women are far more supportive of Clinton than Trump -- plus-31 in New Hampshire and Pennsylvania and plus-21 in Michigan -- but Clinton's running closer to Trump among men than in past polls. In New Hampshire, a state she lost badly in the primary and Trump won easily, Clinton's actually leading with men.

Part of Trump's problem is that Republicans aren't solidly on-board. Clinton gets 89 percent of Democrats in New Hampshire and 78 percent in Pennsylvania. Trump gets two-thirds of Republicans in the Granite State and only slightly more in Pennsylvania -- and this is in a head-to-head match-up. More remarkably, Clinton's net favorability in each state -- the percentage of those saying they view her positively minus those who view her negatively -- is about even. Trump's is minus-30.

This week -- an epically bad one for Trump -- has seen a number of prominent Republicans bail on his candidacy. If Trump manages to reel Republicans back in, to get them to back him at the rates they backed Mitt Romney in 2012 or John McCain in 2008, these numbers would improve a great deal. If the party continues to gingerly step away, though, that would likely become a lot harder.

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The worst news in these polls is in Pennsylvania. The state is essential to Trump's candidacy, both because he has argued that working class white voters in the Rust Belt will flock to his candidacy and because he needs to pick up some states Romney lost four years ago to beat Clinton, and Pennsylvania's been shifting more Republican. In an interview with a local news program in Florida on Tuesday, Trump said that, "in Pennsylvania, we're doing fantastically." He isn't.

It's critical to remember that, however wobbly it might be, Trump's Jenga tower hasn't collapsed. This is a very good moment for Hillary Clinton, but that doesn't mean she can maintain the leads she's seen in these polls.

If we compare the RealClearPolitics polling averages from these three states to where Barack Obama was in 2012, you can see that Clinton's margins aren't that much better, and that in 2012, Obama hadn't yet had his convention. The most important part of the graphs below, though, is what happened after the first debate between Romney and Obama. That debate was disastrous for Obama, and his poll numbers tanked afterward.

Political Jenga is more like a Jenga competition, where each campaign is trying to hold its own tower together. Trump's tower isn't stable right now, but if he can use moments like the debates to shake Clinton's -- which Romney did to Obama in 2012 -- he can still win this thing. In that Florida interview, Trump indicated that this was his strategy. "More focus on Hillary Clinton causes a disaster," he said. "We're going to focus more on Hillary Clinton."

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He just has to make sure his tower doesn't collapse first.

More on the Florida poll

As with the other surveys, Clinton does better with women (leading by 12 points) than men (she trails by 1 point). Most noteworthy in the demographic breakdown is that she trails Trump by 7 points with white votes but leads by 38 points with nonwhites. In 2012, Romney won white voters in Florida by more than 20 points as he narrowly lost the state.

The Florida poll also mirrors the Pennsylvania and New Hampshire polls in that Clinton's got more support from Democrats (81 percent) than Trump does from Republicans (74 percent). Sixteen percent of Republicans plan to vote for Clinton.

At this point in 2012, Romney had a slight edge in the polling average in Florida. Clinton leads by about 2 points.