Obama gave the GOP the greatest gift of all

[spedtr90]

48. GOP have chained CPI in their RSC budget

The conservative Republican Study Committee Budget 2015 contains the chained CPI. About 70% of House Republicans are members of that caucus.

This budget would slowly phase in an increase in the Social Security full-retirement age. The full retirement age would continue the current-law’s gradual increase of two months per year beginning in 2022 until the full retirement age reaches 70. To further strengthen Social Security’s long-term finances, this budget would change the formula for cost of living adjustments (COLA) by adopting a more accurate measure of inflation (chained CPI-U) that takes into account real-world choices consumers make.

They also favor a voucher program for Medicare:

Transitions Medicare to a solvent premium-support system, as proposed by the Republican House Budget. The RSC budget proposes making this transition in 2019, for workers born in 1954 and later.

In the years the House voted on this budget would have passed, except Republicans realized Democrats were only voting present, and then voted against it - some changing their votes to nay so it would not pass. I suppose if it passed it would have gotten some unwanted attention to what was in it.