Obama could say "I'll go with you on chained CPI, but let's raise the FICA tax cap."
And even in less rancorous times, restructuring the FICA tax would be a gargantuan job.
I agree with Scroll Down from that other thread, who wants to lift the cap (right now around $108,000) on the FICA tax.
An acronym for Federal Insurance Contributions Act. FICA taxes are deducted from the pay of most American workers to support Social Security programs.