"If you want your vote to count, which I assume you do because you're putting it in the mail, don't put it in the mail on Election Day," he said during a Thursday press conference.
The friendly advice for voting early is more of a stern warning for those not living in major California cities.
The advice is specifically for those living more than 50 miles outside Los Angeles, Santa Clarita, San Diego, Sacramento, and Richmond, in the Bay Area, where regional U.S. Postal Service mail processing facilities are located.
For the millions in those areas, the Post Office is no longer promising postmarking mail the same day, so if you mail your ballot on Election Day, it'll be postmarked after November 4, which means it can't be counted.
While there's only one ballot item for this special election, it has huge state and national implications.
The proposed map could add five Democrats to Congress, a plan drawn up by Gov. Gavin Newsom to negate Texas' redistricting plan, which could add five Republicans.
"I wish that we weren't here but Proposition 50 is the answer," said Assemblymember Nick Schultz of the 44th District during a rally in favor of Prop 50. "We have to stand up after what's happening in other states if they're stealing elections. We are going to have consequences here in California to ensure that [President Donald Trump] doesn't get away with it."
With less than a month to go before Election Day, this is already one of the most expensive ballot measures in California history.
According to Cal Access, which tracks political contributions, more than $200 million has been contributed for this ballot measure, with about two-thirds of the total contributions in favor of Prop 50.
California GOP Chairwoman Corrin Rankin, who is against Prop 50, said the gerrymandering drawn up by Democrats is taking your vote away.
"This is our constitutional right to an independent redistricting commission where you let your community decide how you're going to be represented, and who's going to represent you, so when you're asking people to remove their voice, to remove their constitutional right, I think it's incredibly important that everybody have all the information in California know exactly what they will be losing," she said.
California Secretary of State Dr. Shriley N. Weber said they expect a big turnout for this special election, with up to 70% of registered voters casting a ballot, hopefully before the last second.