Koster, Missouri's attorney general, faced no serious primary competition, and was able to focus on raising money while Greitens was spending it. By election night, Koster was sitting on some $10 million in campaign funding — more than 10 times what Greitens had left at that point, records showed.

St. Louis television viewers watching Greitens' victory speech last Tuesday that night also saw Koster's debut campaign commercial.

Following standard political practice for early in a campaign, Koster's commercial is a positive one, introducing him and highlighting his early experience as a local prosecutor. He's leaving it to the separate Democratic Party effort, for now, to hit at Greitens.

What's interesting about Koster's ad is that there's no mention of his party. Someone seeing it cold would have no way of knowing that Koster is the Democratic nominee. That's presumably in deference to the state's generally conservative leanings in recent elections.

It may be the first of many interesting twists in the campaign in terms of the partisan roles, with two party nominees who each used to be members of the opposing party, and switched. Koster used to be a Republican; Greitens used to be a Democrat.