Oh yeah, he got caught
threatening the children of the former Democratic Assembly Majority Leader (CA's lower house) because he didn't get an endorsement. And accusing Swalwell of being funded by Chinese bribes certainly cost him support from normally supportive Chinese voters. It really shouldn't be a competitive race, but Stark has a litany of self-inflicted wounds.
Anyways, it's already pretty obvious he's not running again in 2014, so there's actually quite an interesting situation where both of the people are angling to be anointed his replacement in 2014 are supporting him, before they start savaging one another.
Ellen Corbett is the State Senate Majority Leader and widely expected to run. You'd think she'd be the shoo-in (since California State Senate Majority Leader would be much more powerful a House Rep. if it weren't the term limit forcing her out in 2014), but Ro Khanna, a former Obama administration guy, is also certainly going to run. And he's fundraising literally an insane amount of money from the Indian community (he's Indian). Like about as much as Stark and Swalwell combined despite not actually running this year
Also fun fact, both of them are from the "old" part of the district (like Stark), while Swalwell is from the parts added in during redistricting. So a defeated Swalwell might have be courted by both only two years after they completely savaged him.