Now this is a surprise
Excerpt
A handful of moderate Senate Democrats are looking for ways to roll back the highly contentious individual mandate — the pillar of President Barack Obama’s health care law — a sign that red-state senators are prepared to assert their independence ahead of the 2012 elections.
Read more: politico.com

They would be better off with tax and benefit, as I strongly suspect the SCOTUS is not willing go for the mandate. Huge slippery slope there, IMO. Of course the legislature is best positioned to force severability so we do not toss the “baby with the bathwater”.