A close look at the finances of 31 members of the Senate Democratic caucus who have yet to publicly back Sen. Bernie Sanders’s Medicare for All bill shows they have received significantly more financial contributions from the health insurance industry than those who did sign on as co-sponsors ahead of its introduction on Wednesday.

An analysis by the government watchdog MapLight, released Thursday, found that senators who didn’t back the bill received an average of $55,000 in industry donations since 2010, more than twice the average amount received by the bill’s 16 co-sponsors.

Sanders is the only senator who’s received $0 in donations from the health insurance industry, which would eventually become obsolete under the senator’s plan to make government the single payer of the nation’s healthcare costs—the same kind of system that exists in other high-income nations, with better health outcomes and lower costs according to the independent foundation The Commonwealth Fund.

Out of all the Senate Democrats,  Sens. Gary Peters (D-Mich.), Rob Wyden (D-Ore.), and Chuck Schumer (D-N.Y.) have received the most donations from health insurance companies, each gathering more than $130,000 in contributions from the industry since 2010. None have supported Sanders’s plan, even though a spokesperson for Schumer said this week, “Democrats believe that healthcare is a right for all.”

In a segment that aired Wednesday night, hosts at “The Young Turks”—Ana Kasparian, Jimmy Dore, and Ron Placone—offered another close look at some of the Democrats who have so far decided not back Sanders’s Medicare for All bill:https://www.youtube.com/watch?v=kTSlGCgF2nM