Charles Munger Jr., the Bay Area megadonor leading the campaign against Proposition 50 , said he remained confident opponents can defeat the redistricting measure on the November ballot, despite a recent slowdown in their campaign spending and the measure pulling ahead in most polls.

The Palo Alto physicist has spent nearly $33 million against Proposition 50, which would replace California’s current congressional lines, drawn by a citizen commission, with a map favoring Democrats . Munger Jr. bankrolled the 2008 ballot measure that created the citizen commission and is far and away the top spender in this year’s campaign.

“I’ve spent a literal fortune now and a great deal of time, energy and frankly agony in trying to keep this future from overtaking the people of California,” M

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