Because criticizing Jeb Bush’s rivals’ positions on important issues apparently isn’t working, a pro-Bush Super PAC is instead going after Marco Rubio’s choice of footwear.

The Right to Rise PAC released a web video Tuesday titled, “Boots.”

It’s a spoof of Nancy Sinatra’s “These Boots Were Made For Walkin.'”

The ad begins with someone strutting across the screen in black boots similar to the ones Rubio was sporting in New Hampshire last week.

These boots are made for flippin’
And that’s just what they’ll do
One of these days young Marco’s
Gonna flip, flop, flip on you

Behind the lyrics are the words cap-and-trade, Syria, Iran and immigration.

You keep spinnin’ when you oughta be truthin’
You keep flippin’ when you shoulda not flop
You keep leavin’ when you oughta be votin’
Now what’s work is work but you ain’t earned it yet

These boots are made for flippin’
And that’s just what they’ll do
One of these days young Marco’s
Gonna flip, flop, flip on you

It ends, “Are you ready Marco’s boots? Start flippin’!”

The ad is in reference to the boots Rubio was pictured wearing while boarding a campaign bus in New Hampshire January 4th.

Rubio dismissed the kerfuffle over his footwear.

“Let me get this right,” Rubio said, according to Today.

“ISIS is cutting people’s heads off, setting people on fire in cages, Saudi Arabia and Iran on the verge of a war, the Chinese are landing airplanes on islands that they built and say belong to them in what are international waters and in some ways territorial waters, our economy is flat-lined, the stock market is falling apart, but boy are we getting a lot of coverage about a pair of boots. This is craziness. People, have they lost their minds?”