In the 2/24/2012 Washington Times, Phil Kerpen explains why, "Supreme Court must strike down all of Obamacare".
If only the individual mandate is struck down, the other provisions of ObamaCare (including requirements that insurance companies take all comers regardless of pre-existing conditions yet only charge them the same as healthy applicants) would destroy private insurance in the US. Of course, for some leftists, this would be a feature not a bug.
But if we don't want this country to back into a government-run "single payer" system by default, we need to scrap the entirety of ObamaCare. And we need to let our elected officials know where we stand.