The LA Times reports that only 46% of registered voters now support Prop. 30, a drop of 9 percentage points over the last month, and 42% oppose it.

LA Times on the plunging support:

Proposition 30 would temporarily raise taxes on individuals earning more than $250,000 a year and impose a quarter-cent hike in the state sales tax. Enthusiasm for the governor’s plan has fallen across the political spectrum.

The steepest decline is among voters who register without a party preference — a crucial voting bloc for Brown. Support from those Californians dropped from 63% a month ago to 48%.

“Proposition 30 has been under attack from the left and the right,” said Dan Schnur, director of the Jesse M. Unruh Institute of Politics at USC. “It has taken a toll.”

The USC Dornsife College of Letters, Arts and Sciences/Los Angeles Times poll surveyed 1,504 registered voters by telephone from Oct. 15 to Oct. 21. It was conducted by Greenberg Quinlan Rosner Research, a Democratic firm, in conjunction with American Viewpoint, a Republican company. The margin of error is 2.9 percentage points.

The poll yielded some hopeful signs for Brown. His approval rating, now at 45%, has not dropped along with his initiative, suggesting that he can be a credible pitchman for undecided voters, the largest group of which are fellow Democrats. A strong turnout for President Obama on election day could also give him a boost.

The governor is now hitting the campaign trail, with events aimed at mobilizing Democrats, whose support for his proposal slid in the last month from 72% to 65%. He has been making stops at colleges and churches and rallying Latino leaders.

The background music on this clip below is somewhat distracting but makes the intended point:

California radio show Jon and Ken oppose the tax hikes: