Today on "Fox News Sunday," Sen. John McCain (R-Ariz.) called for Senate Republicans to put out a detailed agenda of the party's policy ideas, but when pressed about his position on changing Social Security, he said he "can't endorse a specific proposal."When host Chris Wallace asked McCain whether he is "comfortable with some of the Tea Party ideas that would dramatically shrink the size and the scope of the federal government," the senator said he favored repealing and replacing "Obamacare," introducing a balanced budget amendment, and eliminating pork barrel spending -- ideas that could constitute some sort of contract with America.