Question

fix any punctuation or capitalization errors below. click \submit answer\ if there are none.
steven universe helped the mayors campaign by: putting up posters, making phone calls, and throwing a fundraiser.

Explanation:

The original text uses a colon correctly after "by" to introduce a list, and the commas and capitalization are already accurate. No punctuation or capitalization errors need fixing.

Answer:

Steven Universe helped the mayor's campaign by: putting up posters, making phone calls, and throwing a fundraiser.