It’s been 120 days since Action network started tracking the Democratic vice presidential nominee odds, and for all 120 days, Kamala Harris has been the favorite.

Now with Joe Biden’s self-assigned deadline to announce his running mate in the first week of August nearly here, Harris has her most favorable odds yet: At -175, the betting market gives her a 63.7% implied probability of joining Biden’s ticket.

There’s only one other potential candidate with odds that translate to better than 10% implied probably: Susan Rice.

After being near the bottom of the odds board in the spring, Rice’s odds were as short as +260 (27.8%) in mid-July. The former national security advisor has lost some traction since, though, now sitting at +333 (23.1%).

The respective movements of Harris’ and Rice’s odds reflect a recent change in Smarket’s prediction market data, which had Harris gaining 20 percentage points (33% to 53%) and Rice losing 13 (32% to 19%) over the span of 48 hours after Biden’s notes on the candidates on his shortlist were photographed.
Biden's campaign announced on Tuesday, August 11 that the former California attorney general Harris will be his vice-presidential pick, making her the first Black and South Asian American woman to run on a major political party's presidential ticket.