Following up on this post, CA Secretary of State candidate Alex Padilla has now written answers to the CfER survey on election reform.  But look at this response on top two:

What is your opinion of the top-two primary in particular and two-round
runoff systems (as used by many local jurisdictions) in general?  What are
your thoughts about replacing the top-two primary with, for example, a
single IRV election with all the candidates in November, or a 'top four'
system that winnows the field to four candidates in June and then uses IRV
to determine the final winner in November?  Do you have other ideas as to
how to ensure that the most popular candidates advance to a later
final-round general election or runoff?

Beyond an election's format, the essential question we have to answer in
California is how to get more voters engaged and participating in our
democracy.  Regardless of an election's format, we know that currently,
there are millions of Californians who do not vote and millions of
Californians who aren't even registered.  We need to work to engage more
Californians in voting.  That's why I've pledged to register a million more
voters in my first term as Secretary of State and prioritize visiting high
schools throughout California to cultivate civic engagement among the next
generation of California voters.  At the same time, we also must work to
increase trust and confidence of government.  That's why I've introduced a
tough package of campaign finance reforms in the state legislature to ban
fundraising during the last 100 days of session and strengthen campaign
finance disclosure and reporting.  By working to engage more Californians in
elections, and working to institute reforms to restore trust in government,
we can strengthen our democracy.