Republican gubernatorial candidate David R. Craig has launched what appears to be the first volley in what is expected to be a multimillion-dollar broadcast media war with an ad on Baltimore radio stations highlighting his proposal to phase out Maryland's income tax.

Craig, the Harford County executive, will run the 30-second spot on WBAL and WCBM. According to his campaign, it is the first paid media ad of the 2014 campaign for governor.

Craig is in a four-way race for the Republican nomination with former Ehrlich administration official Larry Hogan, Del. Ron George of Anne Arundel County and Charles County business executive Charles Lollar.

In his ad, Craig tells listeners: “I’m David Craig. My plan will lower, and put us on a glide path to do away with the state personal income tax. We’ll jump start economic growth, create jobs and keep Maryland families together.”

Craig has proposed a gradual phase-out of the income tax -- Maryland's largest revenue source -- promising to pay for it with spending cuts and increased business activity.