Based on how thorough-going are Obama's attacks on the middle class, I'd say it's all intentional, something the professor would not dare say if he wants to keep his career, so I'll say it for him since I don't have a career to save.
Summarized from an op-ed by Peter Morici, University of Maryland,
here:
His immigration policy swells the ranks of visa-holders in skill-short areas like engineering as well as the ranks of semi-skilled immigrant workers, frustrating the middle-class aspirations of the working poor born in this country.
His massive expansion of student loans permits universities to jack up tuition . . . Students are graduating encumbered by massive debt and too few marketable skills. Broke and unemployed, they are not marrying and starting families—that shrinks the middle class.
Despite the availability of loans, skyrocketing tuition mandates ever greater family contributions to finance college. This puts higher education further out of reach for many working class families, and fewer low income children are pursuing post-secondary education than in the past—that shrinks the middle class too.
The President has jacked up taxes on families earning more than $250,000. Unfortunately, most businesses in America are either proprietorships or pass through corporations that pay those higher individual, as opposed to corporate, tax rates, raising the cost of investing and expanding businesses—that spells fewer jobs for the middle class and those that aspire to its ranks.
Unable to push through Congress limits on CO2 emissions, President Obama has used executive orders and the EPA to impose limits by fiat. Unfortunately, those raise manufacturing costs, China has no such limits, and all this encourages business to outsource in China—again fewer jobs for the middle class and aspiring middle class.
Free trade agreements that permit trading partners to undervalue their currencies, subsidize exports and artificially under price their products on U.S. store shelves, health care mandates that raise the price of insuring employees instead of controlling costs, unnecessarily cumbersome regulations to run factories, mindless limits on developing U.S. oil reserves, and exporting abundant natural gas to countries that shut out U.S. products with high tariffs all encourage outsourcing, not just in manufacturing but for many supporting services too—yet again, fewer jobs for middle class Americans.
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“The lower middle-class,” in Marx’s words, “has no special class interests. Its liberation does not entail a break with the system of private property. Being unfitted for an independent part in the class struggle, it considers every decisive class struggle a blow at the community. The conditions of his own personal freedom, which do not entail a departure from the system of private property, are, in the eyes of the member of the lower middle-class, those under which the whole of society can be saved.”
And this is the very reason why the lower middle-class masses are the most dangerous enemies of the dictatorship of the proletariat. They represent a very strong section of society. Their special interests are absolutely incompatible with the economic disturbances which are the inevitable accompaniment of transitional periods.
The disturbance of credit cuts the ground from under their feet. They begin shouting for order, for the strengthening of credit, in such a way that every concession to them leads in effect to a complete restoration of the old order. ...
[Marx] wished to separate the Labour movement from all lower middle class elements, because the lower middle class attitude — attachment to the idea of private property, more or less open striving to uphold credit, terror of every fundamental social disturbance — is in practice the greatest internal enemy of the proletariat and the proletarian revolution.
-- Bela Kun,
Pravda, May 4, 1918 (Marxists Internet Archive,
here)