Kind of odd some Democrats and liberals (really stop and consider the historic connotations and political legacies that go with identifying with those terms, the true principles that tie FDR to JFK to Obama) seem near overjoyous at this development...
Is it really that surprising? Suburbanites and the urban elite have always resented rural and working class Americans. Now that the yuppies are crossing over to the Democratic Party because it's "progressive" and "modern", you'll see the party to start to mirror their feelings about the working class. It is quickly becoming true that both sides will be willing to sell out the underclass in favor of the privileged elite.
The working class have no permanent friends, no permanent enemies. Just permanent interests.