The federal minimum wage in 1968 was $10.74 an hour in today's dollars. Enough said.
You mean for federal employees?
He means for everyone. The minimum wage was $1.60--$10.74 in 2013 dollars.
http://www.infoplease.com/ipa/A0774473.html
The inflation adjusted minimum wage has been on a steady decline for 35 years.
There's also considerably more downward pressure on unskilled workers' wages than in 1968; higher female labour force participation, globalization opening up competition from 3rd worlders, increased use of technology in low skill jobs etc.