Can a Kentucky State Representative make radio commercials for a bank?

There is a Kentucky state representative named Will Coursey that represents a district in western Kentucky just a little east of the Paducah area. Lately, (and just a few minutes ago as I am sitting here listening on the radio to the Kentucky vs. Indiana NCAA bball game) I have been hearing Coursey do radio commercials during the Wildcat's NCAA games broadcasts for a bank in western Kentucky.

Can he do that? Can a Kentucky state representative make commercials for a bank in his district? Seems beyond the pale to me.