Newest Fox News piece: So How Much Do Public Union Workers Really Make?

My newest Fox News piece starts this way:

President Obama lashed out at Republicans Monday for having "denigrated or vilified" public union employees. Without collective bargaining and the ability to go on strike, he said we wouldn't be able to attract "the best and the brightest to public service." Are public employees simply the best and the brightest? Or are we simply lavishing them with much better employment deals than their private counterparts?
To measure how attractive a job is, economists study how employees vote with their feet -- that is, comparing the rate at which different categories of employees voluntarily quit their jobs.
Over the last six months, private workers have been 3.4 times more likely to quit their jobs than either state and local or federal workers. Indeed, no private industry comes close to the low "quit rate" for government employees. Manufacturing, which has the lowest rate, still faces twice the quit rate as the government. . . .