In advance of the "America's Future Now" progressive convention in D.C. next week, organizers are set to hold a conference call tomorrow in which they'll declare the U.S. to officially be a "center-left nation."

The organizers -- Rock the Vote executive director Heather Smith, Women's Voices. Women Votes president Page Gardner, Campaign for America's Future co-director Robert Borosage, Media Matters for America president Eric Burns -- will make the announcement early Wednesday afternoon in conjunction with the release of a new report that will reportedly "show that with conservatives more and more isolated, majorities of Americans hold progressive positions on a broad range of controversial issues and key constituencies that favor progressives are growing larger."

Advertised attendees at the June 1-3 conference include Howard Dean, Sens. Tom HarkinThomas (Tom) Richard HarkinDemocrats must question possible political surveillance Wisconsin lawmaker gets buzz-cut after vowing not to cut hair until sign language bill passed Democratic debates kick off Iowa summer sprint MORE, Jeff MerkleyJeffrey (Jeff) Alan MerkleySenate committee advances budget reform plan Harris proposes keeping schools open for 10 hours a day Overnight Energy: Dems ask Trump UN ambassador to recuse from Paris climate dealings | Green group sues agencies for records on climate science | Dem wants answers on Keystone oil spill MORE and Sherrod BrownSherrod Campbell BrownSunday shows — New impeachment phase dominates Brown confirms he won't enter 2020 race: 'I think it's a good field' GM officially sells Ohio plant, months after Trump touted sale MORE, and Reps.Barney Frank, Barbara Lee, Jared Polis, Donna Edwards, Keith Ellison, Jan Schakowsky and Raul Grijalva. Gov. Ed Rendell is listed on the schedule as an invited speaker.

Barack ObamaBarack Hussein ObamaJuan Williams: Honesty, homophobia and Mayor Pete Democrats debate how to defeat Trump: fight or heal 3 ways government can help clean up Twitter MORE has spoken at the campaign's previous Take Back America events, like this closing address from 2006: