Doug Henwood makes the case:
Since 2000, unions have given over $700 million to Democrats—$45 million of it this year alone (Labor: Long-Term Contribution Trends). What do they have to show for it? Imagine if they’d spent that sort of money, say, lobbying for single-payer day-in, day-out, everywhere.
Scott Lemieux strikes back:
[W]e wouldn’t be any closer to single payer than we are now. Even if we generously assume that this lobbying campaign would increase public support for single-payer, a lack of public support for single payer is not the crucial barrier. You need, in concrete terms, to explain how this campaign would get a majority for single-payer in the House and a supermajority in the Senate. Under current conditions, no lobbying campaign is going to get single-payer the slightest consideration in the House.
(Chart by Henwood)