There's a piece on Paul Ryan...

...in this Sunday's New York Times Magazine. Here's the money paragraph (my emphasis):

Jared Bernstein, who read Ryan’s fiscal proposals when he worked as chief economist and economic adviser to Vice President Biden, was more pointed regarding Ryan’s credibility. “He definitely talks the talk,” Bernstein told me. “He has a great facility with a particular set of words, like ‘baseline,’ ‘nondefense discretionary’ and things like that.” Bernstein said he eventually came to the view that while Ryan might understand basic concepts, “he does not actually understand what it takes to craft a budget.” This became clear when Ryan was chairman of the House Budget Committee after 2010. “I would say at this point that his budgetary knowledge is a stalking horse for his ideology,” Bernstein told me, meaning that what was important wasn’t the actual balancing of the budget but the slashing of government spending and programs like Medicare and Social Security and the revenue-generating taxes that pay for them. By picking Ryan, Romney signaled that he too was all-in on Big Idea conservatism. And here was the guy, popular with the base and well liked in Congress, who was going to help him sell it to America.