Get America Covered is a left-of-center healthcare advocacy organization founded by former Obama administration officials Lori Lodes and Joshua Peck. Alongside Protect Our Care, the group lobbies to preserve the Patient Protection and Affordable Care Act, better known as Obamacare. According to an October 2017 document (available here), the national co-chairs of Get America Covered include Democratic Party operative Van Jones, actress Alyssa Milano, former insurance CEO Mario Molina, Bipartisan Policy Center senior adviser Andy Slavitt, and actor Bradley Whitford.
Get America Covered was started as a project of the Hopewell Fund in late 2017. The Hopewell Fund is a 501(c)(3) funding and fiscal sponsorship nonprofit managed by Arabella Advisors, a left-wing consultancy with staff that operate a number of “sister” groups to the Hopewell Fund, including left-wing 501(c)(4) advocacy and fiscal sponsorship group Sixteen Thirty Fund. As such, Get America Covered is not a registered nonprofit and does not file tax returns with the IRS. Nevetheless, it has solicited donations through its website’s donation page, which presumably went to the Hopewell Fund.
The Sixteen Thirty Fund manages two pro-Obamacare groups related to Get America Covered: Health Care Voter and Protect Our Care. Get America Covered co-founder Lori Lodes has also served as the campaign manager for Protect Our Care. The New Venture Fund manages an additional pro-Obamacare project called Save My Care. 
Get America Covered also has previously been listed as part of the Coverage Coalition, which also aims to promote Obamacare. The Coverage Coalition’s source code on its website indicates that it was “made in association with Get America Covered.”
Lori Lodes serves as a co-founder of Get America Covered and campaign manager of another pro-Obamacare group Protect Our Care. Prior to that, Lodes served as chief of staff for communications for Hillary Clinton’s 2016 presidential campaign, communications director for the Centers for Medicare and Medicaid Services in the Obama administration, senior vice president for the Center for American Progress (CAP), senior vice president for campaigns and strategy for CAP Action, deputy communications director for the Service Employees Union International (SEIU).
Joshua Peck serves as a co-founder of Get America Covered and formerly worked in the Obama administration in the Centers for Medicare and Medicaid Services. Between 2016 and 2017, Peck was the chief marketing officer for the poorly received website Healthcare.gov, the Obamacare sign-up website launched in October 2013. Peck also worked for the both the Democratic National Committee and Obama’s 2008 presidential campaign.
Van Jones is a Democratic operative listed as a national co-chair of Get America Covered. Van Jones was formerly a special adviser for green jobs in the Obama administration, a co-founder of both Dream Corps and Color of Change. Jones is also a CNN contributor.
Alyssa Milano is an actress and an activist involved in several left-of-center issues and organizations such as the People for the Ethical Treatment of Animals (PETA). She serves as a co-chair of Get America Covered.
Mario Molina serves as a national co-chair of Get America Covered and was the CEO of Molina Healthcare, a health insurance group.
Bradley Whitford is an actor from “The West Wing” TV show and a left-leaning activist. Whitford serves as a co-chair of Get America Covered.
Get America Covered is a project of the Hopewell Fund, a 501(c)(3) funding and fiscal sponsorship organization managed by the left-leaning consultancy Arabella Advisors. According to the Wayback Machine, by November 2017, Get America Covered removed a donation link from its website. The donation page was hosted by the left-wing fundraising organization, ActBlue Charities.