Middle-class people are struggling to save for retirement. (Kzenon – Fotolia—stock.adobe.com)

A secure retirement isn't a gimme for the middle class. The reason? They can't afford to save. Housing, healthcare, debt payments and other financial priorities are consuming a larger share of household budgets — leaving middle-class workers with less money to sock away in 401(k)s and IRAs. Dan Doonan, executive director of the National Institute on Retirement Security (NIRS), calls…