The legislation from state Sen. Jim Ananich and state Rep. John Cherry would extend the statute of limitations for crimes related to the Flint water crisis.
Just an hour's drive from Flint, the presidential hopefuls said little about the growing list of threats to America's drinking water.
Snyder's administration was blamed for the Flint water crisis, but the Kennedy School honored him with a teaching position.
Castro, a former Housing and Urban Development secretary, is the first presidential hopeful to announce a dedicated plan on the issue.
Lead exposure can impair brain function and cause miscarriages, and yet millions of lead pipes remain in use.
With Water Box, a portable filtration system created with support from Jaden Smith, First Trinity Missionary Baptist Church hopes to help ensure residents' access to safe drinking water.
The tech billionaire committed to helping the Michigan city in July in response to a Twitter user.
Emily Sioma won plenty of hearts with her activism, though New York's Nia Imani Franklin won the pageant.
Scott Smith now says there was no scientifically known reason not to use the water for bathing.
City and state officials said they received little advance warning of the decision.