On "Their Fair Share"

Folks like Obama and Sanders are always saying that the rich need to pay "their fair share". But they never, ever, ever, ever, EVER, articulate what that amount should be. Here are the current stats (2012 returns being the most recent) - According to the IRS (data compiled by the Tax Foundation), the top 1 percent (1.37 million taxpayers earning $434,682 and more) paid 38 percent of all federal income taxes, the top 5 percent (those earning $175,817 and more) paid 59 percent, the top 10 percent (those earning $125,195 and up) paid 70 percent, and the top 25 percent (those earning $73,354 and up) paid 86 percent. WHAT SHOULD THESE NUMBERS BE? Operationalize your talking-point, for Christ!..............................................................................................................P.S. Just to be complete here, the bottom 50 percent (people earning $36,055 and less) paid a little less than 3 percent of federal income taxes with slightly over 90 percent of those households having no federal income tax liability at all (many actually GETTING money from the government in the form of earned income tax credit).