A motion for summary judgment shall be granted when the moving party has demonstrated that the action, claim, cross-claim, or counterclaim subject to the motion is an action involving public petition and participation unless the party responding to the motion demonstrates that the action, claim, cross-claim, or counterclaim has a substantial basis in fact and law or is supported by a substantial argument for an extension, modification, or reversal of existing law. The court shall grant preference in the hearing of such motion.