The problem for democrats isn't their ideas or a lack of talking about jobs and economic growth, the problem is that voters instinctively sense that both parties are fungible in terms of economic outcomes regardless of what they say, so they stop critically thinking about a candidate's policy proposals and become easily swayed by bluster and demagoguery; this is a losing position for democrats because republicans are much better at these tactics and the result is the continued decline of the democratic party.