California Proposition 50 will pass, ABC News projects

A packed house of supporters roared Monday as Gov. Gavin Newsom made his closing argument for Proposition 50, a ballot measure that could reshape California's congressional maps.

"They poked the bear, and the bear is poking back," Newsom told the crowd. "Prop 50 is not about drawing lines on a map. It is about holding the line to what makes us who we are."

A packed house of supporters roared Monday as Governor Gavin Newsom made his closing argument for Proposition 50.

Flanked by prominent elected Democrats and union leaders, including labor activist Dolores Huerta, the governor urged his party to leave everything on the field and turn out "in record numbers."

Ballot for the California Proposition 50 special election have been rolling into state county registrar's offices since October.

Mail-in ballots must be postmarked on or before Election Day and received by Nov. 12.

See the map below for county-by-county data on how many vote-by-mail ballots have been returned and accepted so far.

Same-day voter registration is open now at county election offices and vote centers up to and including Election Day.

You will be able to vote in the special election and register to vote at the same time. You will be given a provisional ballot.

When your voter registration is approved, your provisional ballot will be counted.

Find a vote center near you on the CA Early Voting website here.

When you get your mail-in ballot, it will have your ballot and an envelope with prepaid postage inside.

Fill out your ballot, checking the front and back of your ballot to make sure you didn't miss anything. For the California Prop 50 special election, there is only one sheet and one question for the ballot.

When done filling out your ballot, fold it and put it in the provided return envelope. Seal the return envelope.

On the envelope, date and sign it. Make sure the signature matches the one on your driver's license/ID or one provided when registering to vote. Election officials will compare the signature on your envelope to the signature on file.

There are three ways to return your mail-in ballot:

1) You can put your signed and dated return envelope in the mail.
2) You can put your mail-in ballot in a ballot dropbox in your county.
3) You can drop off your ballot at a vote center.

You can track you mail-in ballot on the Where's My Ballot website here.