This is smart, because Clark's major obstacle is going to be the idea that he doesn't know domestic policy. If he can make strong proposals and show that he knows what he's talking about, he can make up for his lack of experience.
His experience in domestic policy is more extensive than one would think. His command experience made him responsible for just about every aspect of the soldiers and soldiers families. That of course, included things like education for children, healthcare etc. Do not discount this experience. Experience is experience regardless of whether it was as an elected offical.