Apparently it's gotten worse since 1988.
http://www.politico.com/magazine/story/2015/01/income-gap-at-the-polls-113997
Does this mean that Galbraith was right all along? Not exactly. The reason for the recent shift in the findings is not that the early studies were wrong, but that the preferences of voters and nonvoters are becoming increasingly divergent. In a paper published in 2007 and later expanded into a 2013 book, Who Votes Now, political scientists Jan Leighley and Jonathan Nagler found that wide gaps between voters and nonvoters have opened up when it comes to class-based issues. They argued further that the seeds of these differences were apparent in earlier data, but Wolfinger and Rosenstone overlooked the gaps by focusing on broad ideological labels (liberal or conservative) rather than specific policies. Voters, Leighley and Nagler found, are more economically conservative; whereas non-voters favor more robust unions and more government spending on things like health insurance and public schools
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Other data collected on the national and state level support Leighley and Nagler’s thesis. A 2012 Pew survey found that likely voters were split 47 percent to 47 percent between Obama and Romney while non-voters preferred Obama 59 percent to 24 percent, a 35 point margin. A 2006 Public Policy Institute of California (PPIC) study found that non-voters were more likely to support higher taxes and more government-funded services. They were also more likely to oppose Proposition 13 (a constitutional amendment which limits property taxes), dislike then -Gov. Arnold Schwarzenegger and support affordable housing.
It so happens that the gap between voters and non-voters breaks down strongly along class lines. In the 2012 election, 80.2 percent of those making more than $150,000 voted, while only 46.9 percent of those making less than $10,000 voted. This “class bias,” is so strong that in the three elections (2008, 2010 and 2012) I examined, there was only one instance of a poorer income bracket turning out at a higher rate than the bracket above them. (In the 2012 election, those making less than $10,000 were slightly more likely to vote than those making between $10,000 and $14,999.) On average, each bracket turned out to vote at a rate 3.7 percentage points higher than the bracket below it.
This class bias is a persistent feature of American voting: A study of 40 years of state-level data finds no instance in which there was not a class bias in the electorate favoring the rich—in other words, no instance in which poorer people in general turned out in higher rates than the rich. That being said, class bias has increased since 1988, just as wide gaps have opened up between the opinions of non-voters and those of voters.
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