Kentucky Secretary of State Trey Grayson launched his first Republican Senate primary commercial Monday with a 30-second ad that seeks to dig in to conservative activist Rand Paul’s support in the coal mining communities of eastern Kentucky.

The ad, running on broadcast and cable television, touts Grayson as a supporter of coal jobs and paints Paul as having a history of opposing coal.

It includes a clip of Paul, the son of Texas Rep. Ron Paul (R), in a 2008 speech in which he said, “Coal’s a very dirty form of energy.”

“The thing is that it’s probably one of the least favorable forms of energy,” the clip says.

In the ad, Grayson counters by saying, “I’ll fight against Obama’s war on coal and for clean coal and Kentucky jobs.”

Grayson’s camp declined to release the size of the ad buy or how long it would be on the air. The ad follows a 60-second radio ad that Grayson released that discussed the need to cut federal spending.

Last week, Paul made a $5,000 radio buy on Christian radio stations after dropping $50,000 on a statewide cable buy in early February.

The winner of the GOP primary in May will almost certainly face either Lt. Gov. Daniel Mongiardo (D) or Attorney General Jack Conway (D) in the general election.