Tergiversate (tur-jiv-er-say-t)

(verb) to change one’s thoughts and opinions in order to fit a certain cause or situation; to turn renegade.

Examples:

  1.  June is optimistic about a day when politicians will stand true to their beliefs instead of tergiversating to gain approval from voters and donors.
  2. Firm in her attitude and belief starting out in the relationship, June was determined not to tergiversate in order to make her boyfriend happy.