band·wag·on
 /ˈbændˌwægən/  noun  ,  pl   -ons [  count  ]
  : a popular activity, effort, cause, etc., that attracts growing support
  — usually singular
   trying to get/keep a political bandwagon rolling
   Local leaders jumped on the bandwagon in support of the legislation.
   Many companies are getting/climbing on the bandwagon and offering flexible schedules to their employees.