I guess "One neck, one leash" would have been a little too obvious

"Democratic presidential frontrunner Hillary Clinton said Sunday that her campaign’s main slogan is 'Stronger Together' in an effort to define her candidacy’s message as Sen. Bernie Sanders (I., Vt.) and Donald Trump have successfully done with concise phrasings of their own to gain support this election season."

Nah, let's go with truth in labeling: