(Mark Duncan/AP)

A poll this week from the Washington Post and ABC News showed that Latinos were actually pretty okay with the idea of a GOP-controlled Senate.

And now another key Democratic constituency — young people — is giving something of its own blessing.

A new poll from the Harvard Institute of Politics studied more than 2,000 Americans between the ages of 18 and 29. This is a group, mind you, that voted for President Obama by 23 points in 2012 and 34 points in 2008.

As of today, though, young people who are definitely voting in the 2014 election next week favor a GOP-controlled Congress by four points, 51 to 47.

That's even worse for Democrats than in 2010, when young people preferred a Democratic Congress by 12 points, 55 to 43. And that was a really bad year for Democrats.

But before Republicans begin embracing their newfound constituency, it should be noted that it's not really because young people are joining the GOP. In fact, just 22 percent of all young people identify as Republicans and just 23 percent approve of the job Republicans in Congress are doing. In addition, young people still trust Democrats more on the key issues of the day — albeit narrowly in most cases — and favor Democrats on the generic ballot.

But the poll does reflect the fact that young people who voted for Obama have soured somewhat on the Democratic Party and can't be counted on to vote. Just 35 percent approve of congressional Democrats, and just 43 percent approve of Obama.

“They're less supportive of Democrats, but that doesn't mean they're more supportive of Republicans," said John Della Volpe, polling director at the Harvard IOP.

That's a key distinction over the long term. But for next week, it's still a pretty tough pill to swallow for Democrats.

To recap, in the past few days, it has become pretty clear that Americans in general, Hispanics, unmarried women and now young people have sufficiently soured on the Democratic Party. And the latter three — three of the four cogs in the so-called "Obama coalition" — aren't looking like very reliable Democratic votes Tuesday.

In fact, this poll suggest that might be an understatement.