The idea here is that if there was agreement from a certain group(capital), the measure doesn't go far enough.
The thing is that, while I certainly agree that the top fifth and large corporations have to put in more in rightly designed ways, the vote totals above (I haven't voted yet) show that nobody thinks that the middle three-fifths of income earners or retirees should sacrifice "the most," and there are very few votes for "defense contractors" too. But if you look at the biggest expenditure classifications of the federal budget, these three groups are the recipients of considerably large portions of current benefits. It seems to me that if these groups want the benefits to continue at even comparable levels in the future, they have to be willing to put more in, and should see putting more in as an "investment" and not an outright "sacrifice." We can't continue comparable benefit levels infinitely into the future in the face of ever-rising costs if we continue to borrow two dollars of every three that we spend.