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Apr. 3, 2017 at 6:07 PM

Sen. Claire McCaskill, D-Missouri, at a hearing Jan. 12.

At least 41 Democratic senators have publicly committed to filibuster President Trumps Supreme Court nominee, Neil Gorsuch, leading to a probable showdown with Republican Senate Majority Leader Mitch McConnell.

The filibuster might seem like payback for Democrats after Republicans refused to consider the nomination of then-President Obamas Supreme Court nominee, Merrick Garland, for 293 days starting last year. Unlike Republicans last year, however, Democrats dont have all that much power. They arent in the majority and McConnell has strongly hinted that he could seek to eliminate the filibuster for Supreme Court picks if Gorsuch cant get 60 votes. Across a variety of surveys, moreover, a plurality of voters think the Senate should confirm Gorsuch, although a fair number of voters dont have an opinion either way. Therefore, Democrats political endgame is unclear.

Gorsuch is quite unpopular with liberal voters, however: By a 61-15 margin, they oppose his confirmation, according to a YouGov poll last week. Thus, the planned filibuster may simply be a sign of the liberal bases increasing influence over the Democratic coalition. The share of Democrats who identify as liberal has steadily increased over the past 10 years. According to the recently released Cooperative Congressional Election Study, 53 percent of Democratic voters identified as liberal last year. Until recently, it was rare to find surveys that showed liberals made up a majority of the party.

But to some extent, that 53 percent figure understates the case. The CCES also asked voters about whether theyd engaged in a variety of political activities, including donating to a candidate, attending a political meeting, working on behalf of a campaign or putting up a political sign. Among Democrats whod done at least one of those things a group Ill call politically active Democrats 69 percent identified as liberal. These were some of the voters who helped propel Bernie Sanders to almost two dozen primary and caucus victories last year.

Oftentimes these liberals are found in states where you might not necessarily expect them such as in the Mountain West, which was a strong region for Sanders last year. According to a regression analysis conducted on the CCES data, the proportion of politically active Democrats who identify as liberal is larger in states where candidate Trump fared poorly. But controlling for that, its also larger in states that have more white voters, and more college-educated voters. And its larger in the West than in the other political regions of the country. In the table below, Ive estimated the share of politically active Democrats in each state who identify as liberal. Since the sample sizes for some states are small, the estimates are based on a blend of the raw polling data from the CCES and the regression model I described above.

Source: Cooperative Congressional Election Study

Its not surprising that Washington, Oregon and Vermont are places where the liberal wing of the Democratic base dominates. But Idaho, where I estimate that 82 percent of politically active Democrats identify as liberal, and Utah, where I estimate that 80 percent do, also rate near the top. Its not that Idaho and Utah are blue states, obviously; theyre among the most Republican in the country. Nonetheless perhaps because a lot of moderate voters identify with the GOP in these states the few Democrats that remain are overwhelmingly liberal.

The same phenomenon holds in Montana, where I estimate that 76 percent of politically active Democrats are liberal. That may help to explain why Sen. Jon Tester of Montana says he will vote against Gorsuch, even though he faces a tough general election campaign next year. Whether or not Democrats would issue a primary challenge to Tester, who has generally sided with the party on key votes, is questionable. Nonetheless, hell be relying on his base for money, volunteers and a high turnout on Election Day. In Montana, the conservatives are conservative but the Democratic base is fairly liberal also.

By contrast, Democratic Sens. Heidi Heitkamp of North Dakota and Joe Manchin of West Virginia, who will vote to confirm Gorsuch, are on somewhat safer ground. Some 61 percent of politically active Democrats identify as liberal in North Dakota, while 57 percent do in West Virginia, according to this estimate. Those figures are almost certainly higher than they would have been a few years ago. But Heitkamp and Manchin probably face more risk from the general election than from a loss of support among their base.

Nor is the Democratic base all that liberal in the Mid-Atlantic region, including states such as Maryland, Delaware and New Jersey. Instead, even the party activists in these states can have a moderate, pro-establishment tilt. That may explain why senators such as Chris Coons of Delaware and Robert Menendez of New Jersey were slow to announce their positions on Gorsuch before eventually deciding to oppose him.

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The Gorsuch Filibuster Shows The Liberal Base's Clout - FiveThirtyEight