Some group on the left is putting up Facebook ads "Stand with President Obama: It's Time to Raise the Minimum Wage." Just what we need when a fifth of the workforce is either unemployed or underemployed and job market participation is at a generational low.
It does help the folks who are getting by at that wage, but raising the minimum cuts off the lower rungs off of entry-level jobs. Marginal jobs will be eliminated and any remaining jobs just above minimum will have a larger pool of workers competing for it, making it harder for new workers or workers who fall through the cracks to find a niche.
When you combine a move to $9/hr as the president proposed with the beginnings of the ACA come January, you might have a effective minimum wage of about 11 dollars an hour, taking out a whole swath of lower-wage positions with it. Not bad if you're selling robotics or are in a union that has its folks well above minimum and just took out some scabby competition, but not good if you're looking to get into the workforce.
If you insist on all wages being able to support a family, folks may never get to that point if they never get a job in the first place to learn how to work and be useful. You'll wind up creating an unemployed pool of folks who never get a career going.
Doing something along the line of an earned-income tax credit to fill the gaps would be more helpful for those folks on the bubble than another minimum wage hike; however, the former comes out of the taxpayers' hides rather than employers, so it's easier to do for politicos.