In The Guardian:

[P]erhaps surprisingly, given that she is among the most successful political fundraisers in America today, Speaker Nancy Pelosi has set the only meaningful bar. HR1, the reform package that she passed in the House, was extraordinary not just because of the incredible range of reform packed into that single bill… It was also extraordinary because it recognized that reform must happen first. “Fix democracy first” has become the slogan of many in this movement. And the essential question that we should be asking candidates now is not whether their campaign cash is pure, but whether their commitment to fixing democracy is real.