In the interest of fairness and balance, I note a study has been released that claims Obama's tax plans would cost the economy 700,000 jobs. (According to another study, that's actually 100,000 jobs fewer than The Rominee's!) It was done by Ernst & Young, at the behest of several Republican entities.
Since, as CBO notes, “spending for defense alone has not been lower than 3 percent of GDP in any year [since World War II]” and Ryan seeks a high level of defense spending — he increases defense funding by $228 billion over the next ten years above the pre-sequestration baseline — the rest of government would largely have to disappear. That includes everything from veterans’ programs to medical and scientific research, highways, education, nearly all programs for low-income families and individuals other than Medicaid, national parks, border patrols, protection of food safety and the water supply, law enforcement, and the like. (Blogatorial comment: As I've been saying ad nauseum!)