Not just a candidate. A governing team.
Two people who complement each other, who can genuinely work together, and who both understand the responsibility of the presidency. Two people where, if one had to step into the Oval Office, Americans would feel confident that the direction of the country would continue.
The old way — selecting one popular candidate and then scrambling to find a vice president who might help win a certain state or demographic — is outdated. It does a disservice to the office and to the voters.