Here is a great article: <
http://pewresearch.org/obdeck/?ObDeckID=18>
Here's an excerpt:
"By an overwhelming margin (83% to 14%), the American public favors raising the federal minimum wage to $7.15 per hour -- a hefty $2.00 an hour increase. And nearly half (49%) say they strongly support such an increase. While there are differences in the extent of support across political and socioeconomic lines, raising the minimum wage receives widespread support from both Republicans and Democrats, wealthy and poor.
... In the 30 states where the federal $5.15 minimum applies, 82% say they support a $2-increase to $7.15, while just 16% are opposed. In states where a minimum wage of $7.15 or more has already been passed, 88% are in favor, a difference that is not statistically significant.
Democrats express more support for minimum wage hikes, but the gap between Democrats and Republicans is relatively small in this era of intense partisanship. Raising the minimum wage by two dollars to $7.15 is nearly universally supported among Democrats – 91% favor the idea and just 8% are opposed. Independents agree by an 87%-to-11% margin. A larger proportion of Republicans (24%) opposes an increase to $7.15, yet still 72% are in favor."
Here are a few more graphics: