California Gov. Edmund G. (Jerry) Brown Jr. moving to dispel growing doubts about his political intentions, will declare his presidential candidacy Nov. 8 in Washington, D.C.

Campaign manager Tom Quinn said that Brown will announce his candidacy that morning in a speech at the National Press Club. Sen. Edward M. Kennedy (D-Mass.) is scheduled to formally enter the presidential race the day before, in Boston.

Quinn said that national press coverage in recent weeks has been "obsessed with Kennedy." He said there also has been press skepticism about whether Brown would become a condidate and acknowledged that the campaign has been plagued with fundraising difficulties.

As a result, Brown and his campaign team have decided to speed up the announcement of his candidacy.

"This will remove any ambiguity that may exist about Gov. Brown's intentions to wage a vigorous campaign for the presidency," Quinn said.

Brown is expected to draw clear differences between himself and Kennedy and President Carter on ecnomic issues. Quinn said the California governor believes that the federal government must play a key role in managing the economy, as he is done in West Germany and Japan.

"A stronger government approach is needed rather than the hands-off approach favored by President Carter and Sen. Kennedy," Quinn said.

In an Oct. 10 speech at Columbia University, Brown proposed a restructuring of the petroleum industry and said that the federal government, not the oil companies, should negotiate for foreign oil imports.

The announcement of Brown's candidacy comes at a time when his political fortunes are falling in his home state, according to a poll which appeared today in the Los Angeles Times.

The polls showed that Brown's favorable rating had slipped from 61 to 43 percent during the past year while his unfavorable rating had risen from 37 to 53 percent. The same poll showed Kennedy defeating Carter by 2 to 1 among California Democrats and beating Brown by a 5 to 1 ratio.

Also, Brown's campaign has been struggling to raise money. A report filed Sept. 30 showed the Brown campaign had received contributions of $261,000, well below the $350,000 anticipated at the time. But Quinn said that two fund-raising dinners in Los Angeles and San Francisco next month are expected to raise $300,000.

After announcing in Washington Nov. 8, Brown will fly to Manchester, N.H., for a party with supporters. He will give a noon speech the next day at Yale, address a New York City rally that evening and campaign in Boston Nov. 10.Brown is scheduled to return to California on Nov. 11.