Washington’s political handicappers have spoken: Tonight will be a massacre—a Night of the Long Knives for red-state Democrats.

Let’s hope they are wrong, and not just for partisan reasons. It’s always a small but delectable victory for democracy when the voters humble the political seers and entrail-readers. We’re reminded that running for office is more art than science, and that the people really are in charge after all.

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What’s more, a Republican Senate takeover would almost certainly harden the political stalemate that has brought the U.S. government to a screeching halt. It would purge states that voted for Mitt Romney in 2012 of high-profile Democrats, more perfectly aligning ideological and party allegiances across the widening chasm between red and blue America. 

The problem is, while such ideological and partisan “cleansing” might be making our politics more homogenous from a philosophical and regional point of view, it is also making our country ungovernable. 

Democrats would be doubly damaged by the lopping off of a major part of their pragmatic wing. They’d lose not only control of the Senate, but also political figures who know how to appeal to moderate and independent voters and thus help keep the party centered. Without such talented pragmatists as Mary LandrieuMary Loretta LandrieuCongress needs to work to combat the poverty, abuse and neglect issues that children face Dems wrestle over how to vote on ‘Green New Deal’ Lobbying world MORE (La.), Kay HaganKay Ruthven HaganDemocrats will win back the Senate majority in 2020, all thanks to President Trump The Hill's Morning Report - Presented by Better Medicare Alliance - Dems shift strategy on impeachment vote Former North Carolina Sen. Kay Hagan dies at 66 MORE (N.C.), Mark BegichMark Peter BegichAlaska political mess has legislators divided over meeting place Former GOP chairman Royce joins lobbying shop Lobbying world MORE (Alaska), Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenOn The Money: US paid record .1B in tariffs in September | Dems ramp up oversight of 'opportunity zones' | Judge hints at letting House lawsuit over Trump tax returns proceed Overnight Energy: EPA watchdog slams agency chief after deputy fails to cooperate in probe | Justices wrestle with reach of Clean Water Act | Bipartisan Senate climate caucus grows Overnight Defense: Trump, Erdogan confirm White House meeting | Public impeachment hearings set for next week | Top defense appropriator retiring MORE (N.H.), Mark PryorMark Lunsford PryorTom Cotton's only Democratic rival quits race in Arkansas Medicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation MORE (Ark.), and Mark UdallMark Emery UdallDemocrats will win back the Senate majority in 2020, all thanks to President Trump Poll: Trump trails three Democrats by 10 points in Colorado The Hill's Morning Report — Trump and the new Israel-'squad' controversy MORE (Colo.), Democrats would be a more orthodox—and less interesting—party. 

And, most galling of all, a GOP sweep tonight would reward conservative Obama-haters and put firebrands like Sens. Ted CruzRafael (Ted) Edward CruzOvernight Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families Erdoğan gets earful from GOP senators at White House Senators confirm Erdoğan played 'propaganda' video in White House meeting MORE in the driver’s seat.   

It’s a progressive nightmare, and Democrats are searching for explanations. The media is serving up a simple story-line: It’s all Obama’s fault. 

That’s not entirely wrong. With his job approval scraping rock bottom (40 percent), the president has become something of a millstone around the necks of red- and purple-state Democrats. That’s why we’ve seen more of Bill and Hillary ClintonHillary Diane Rodham ClintonImpeachment hearings don't move needle with Senate GOP GOP divided over impeachment trial strategy 'Too Far Left' hashtag trends on Twitter MORE than Barack ObamaBarack Hussein ObamaThe Democratic race for president may not sort itself out 'Too Far Left' hashtag trends on Twitter Krystal Ball: Patrick's 2020 bid is particularly 'troublesome' for Warren MORE on the hustings in the battleground states. Six years into his presidency, and despite a rebounding economy, 70 percent of the public believe the country is on the wrong track. Some key voter groups that swooned over Obama in 2008 have soured on his cool and disengaged approach to leadership.  

So the president will have to take his lumps, but let’s not go overboard. Congressional Democrats are even less popular, and Republicans even less so. This suggests that deeper structural forces are also at work. 

Historically, midterm elections are seldom kind to sitting presidents, especially sixth-year elections. As Ron Brownstein reports in The National Journal, the president’s party has lost House and Senate seats in 19 of 28 midterm contests since 1900. There are, however, exceptions, including GOP gains in 2002. And Democrats bucked the trend in 1998, when President Clinton enjoyed a remarkable 64 percent approval rate. Like Obama, Clinton faced a hostile, Republican-controlled House that even tried to impeach him. To be fair, though, Clinton had the benefit of an economy that had been roaring for two years before the midterm. 

Midterm elections always draw fewer voters (roughly 40 percent compared to around 60 percent in presidential contests), and the most motivated voters usually want to register dissatisfaction with the way things are going. That falloff is now magnified by generational and racial realignments that have remade the party’s coalitions over the past two decades. 

The Democrats’ rainbow coalition consists of minorities, Millennials and women (mostly college-educated and single). Minorities and young voters are more likely to stay home in non-presidential years, while the Republicans’ white-gray coalition—blue collar, rural, married, older, and disproportionately male—has a stronger propensity to turn out.

Democrats take solace from the emergence of two very different electorates. It means that they can reverse GOP gains in 2016, when the bigger presidential electorate takes the field and they can bring the full demographic weight of their “coalition of the ascendant” to bear. Moreover, the Republicans will have many more Senate seats to defend in 2016, 24 of 34. 

But there’s a hitch: cratering support for Obama among two key components of his 2008 coalition, young voters and Hispanics. According to the Cook Report’s Amy Walter, in Colorado, the quintessential swing state, Latino approval of Obama’s job performance has fallen by 13 points since 2012, to a meager 51-42 edge. Incredibly, Obama is underwater with young voters in North Carolina, who just two years ago massively approved of his performance (70-20). Walter found similar patterns in other battleground states. 

Such trends spell trouble for Democrats in 2016. They suggest that the party’s next nominee can’t just rely on demography but will have to build a new progressive governing majority. To compensate for narrowing margins among Millennials and Hispanics, Democrats will need to do better among white working class and college-educated voters. And to regain the Senate, they’ll have to elect a new crop of pragmatists to replace those they might lose tonight. 

Marshall is the president of the Progressive Policy Institute.