Bayh, Church, and Udall could all have a shot here as well. Udall has a western outsider energy which might appeal to voters post Nixon and contrast Connally in a similar way that Reagan contrasted the southern Carter. I do think Connally as a former Democrat might invoke some tribal anger from the out-party. Church could in many ways make it an election thematically about the long shadow of Landslide Lyndon. Bayh would be a fresh face with big ideas and the backing of the Kennedy family and Ted's endorsement.