On the Clinton campaign trail in Nevada with U.S. Rep. Xavier Becerra

U.S. Rep. Xavier Becerra (D-Los Angeles), center, will leave his congressional seat after 24 years if confirmed as California’s next attorney general. State Senate leader Kevin de León (D-Los Angeles), right, has said he won’t run to replace him.   (Francine Orr / Los Angeles Times )

Sarah Lovenheim, spokeswoman for House Democratic Caucus Chairman Xavier Becerra, right, travels with the U.S. congressman from one event to another in Las Vegas.

Xavier Becerra, a U.S. representative from Los Angeles, makes a call at the Las Vegas home of Maria Gray, second from left, in support of Hillary Clinton.

Congressman Xavier Becerra, center, speaks with supporters of presidential candidate Hillary Clinton at a rally in Henderson, Nev.

Xavier Becerra (D-Los Angeles), chairman of the House Democratic Caucus, greets members of the crowd at a rally for Hillary Clinton at Painter’s Hall in Henderson, Nev.

House Democratic Caucus Chairman Xavier Becerra hops in a car between events in Las Vegas while campaigning for presidential candidate Hillary Clinton.