Obama’s Budget Revives Benefits as Divisive Issue - Oh my goodness: Some on the left have already begun talking about encouraging a liberal Democrat — the freshman Senator Elizabeth Warren of Massachusetts is the name most bandied — to take up the “don’t touch Social Security or Medicare” banner as part of a liberal bid for the party’s nomination to succeed Mr. Obama, even against Clinton or Biden.

From The New York Times:

Whether or not Republicans ever agree to a budget deal with President Obama, one thing seems certain: now that he has officially put Social Security and Medicare benefits on the negotiating table, opponents on his party’s left will make that an issue for Democrats in the midterm elections next year — and perhaps in the 2016 presidential contest.

In the midterm races already taking shape, Democrats who back Mr. Obama’s budget proposals to trim future benefits as part of a long-term deficit-reduction compromise could be attacked from the left and the right.

Liberal groups and some union activists are threatening to recruit candidates to challenge these Democrats in their primaries.

Even if Democratic incumbents do not draw a primary challenger, liberal activists say, they might face a shortage of volunteers motivated enough to do the hard work of campaigning — just as Democrats did in the 2010 midterms, which resulted in big Republican gains.

Looking further ahead, to 2016, some on the left have already begun talking about encouraging a liberal Democrat — the freshman Senator Elizabeth Warren of Massachusetts is the name most bandied — to take up the “don’t touch Social Security or Medicare” banner as part of a liberal bid for the party’s nomination to succeed Mr. Obama, even against Hillary Rodham Clinton or Vice President Joseph R. Biden Jr.

Such talk was stoked when Ms. Warren, within hours of the release of the president’s budget on Wednesday, sent supporters an e-mail sounding an alarm: “Our Social Security system is critical to protecting middle-class families, and we cannot allow it to be dismantled inch by inch.”