The majority of employers are in favor of raising state minimum wages, according to a survey by Careerbuilder, who found that two-thirds of them were in favor of doing so.

But why have employers — historically opposed to minimum wage hikes —  turned into supporters? Here's what CareerBuilder's Harris Poll of 2,188 HR professionals found from employers who want an increase in their state minimum wage:

• It can improve the standard of living: 74 percent
• It can have a positive effect on employee retention: 58 percent
• It can help bolster the economy: 55 percent
• It can increase consumer spending: 53 percent
• Employees may be more productive/deliver higher quality work: 48 percent
• It can afford workers the opportunity to pursue more training or education: 39 percent

Also read: Minimum wage hike could improve health

They were also asked what they thought the minimum wage should be increased to. (Current federal minimum wage is $7.25 per hour.) Here's what supporters of an increase said:

• $8 or $9 per hour: 29 percent
• $10 per hour: 29 percent
• $11-$14 per hour: 19 percent
• $15 or more per hour: 7 percent
• No set minimum wage: 9 percent