I think the most extreme proposal on the left is single payer health care and it has been proposed. The bill isn't even close to the most left-wing plan on the table.
The most extreme proposal on the right are very inadequate versions of tort reform that protect companies from lawsuits but not in ways that ensure those who are legitimate victims are still able to sue, along with various attempts at further deregulating the insurance industry.
I think the proposal on the table is just slightly left of center for the US.