Democrats are getting more bullish about unseating Rep. Dan Lungren. The California Republican has less than 50 percent support in a new poll that shows Democrat Ami Bera within single digits.

Lungren took 46 percent to 38 percent for Bera in the Public Policy Polling survey for the Daily Kos. But the Republican had a 46 percent unfavorable rating, compared to 39 percent who viewed him favorably. Respondents were split 20-20 on favorability on the Democrat.

But Bera, a first-time candidate, has room to grow. He was unknown to 60 percent of the 617 respondents.

The poll was conducted Sep.t 18-19 and has a margin of error of plus or minus 3.9 percent.

Bera is a member of the Democratic Congressional Campaign Committee's Red to Blue program and one of his party's top prospects this cycle.

He held a financial advantage over Lungren as of the last reporting period. The Republican incumbent reported having $800,000 in cash on hand at the end of June, compared to $1.14 million for Bera.

The congressman spent more than $1.3 million on his reelection in 2008.