Define: incumbent, challenger, liberal, conservative, moderate, front-runner,
and dark horse.

incumbent:the holder of an office or post.

challenger:a person who engages in a contest.

liberal: (in a political context) favoring maximum individual liberty in political and social reform.

conservative: holding to traditional attitudes and values and cautious about change or innovation, typically in relation to politics or religion.

moderate:average in amount, intensity, quality, or degree.

front-runner: the contestant that is leading in a race or other competition.

dark horse:a candidate or competitor about whom little is known but who unexpectedly wins or succeeds.

the 2nd option is the answer