Citylaw's advice is essentially correct. The reputation of your undergraduate college usually won't make a difference unless you happen to graduate from an elite institution like Harvard. In that case, it is a soft factor and at least some preference will given based on pedigree. This is especially true at prestigious law schools, who like to admit students from peer institutions.
For example, I have a good friend who graduated from Yale undergrad and it definitely helped him get into a top ten law school. However, the vast overwhelming majority of law school applicants do not graduate from Harvard or Yale. They graduate from places like CSUF. In that case, your admission to law school will be based almost entirely on GPA and LSAT score.
As far as online schools, however, I wonder of there is price to be paid in terms of admissions? I don't really know if there is, I'm just thinking out loud here. Generally, online education is considered somewhat inferior in quality and standards.
I agree with Citylaw's statement that an admissions committee would prefer a 3.8 from an online school vs. a 3.4 from a traditional college, but when you're talking about Tier 1 schools they won't really be forced to make such a choice. I think a more realistic scenario might be that both applicants have a very similar GPA and LSAT, but one went to an online school and the other went to UCLA, Berkeley, or a state university.
Highly respected Tier 1 schools receive many more applicants than they have spaces open, and can afford to be very selective. If a school has enough applicants with high GPA/LSAT profiles from traditional universities to fill their class, I'm not sure if there is an incentive to accept the student with the online degree. I think it's possible that an online graduate could be at a disadvantage when they are competing against similarly qualified traditional applicants.
As Citylaw said, there are also other schools to consider besides UCD. Don't get too attached to the idea of one particular school, because the simple fact is that until you have a real live LSAT score you have no idea where you're going. The LSAT is hugely important.
If you do stay with the online school, I think your best bet is to hit the LSAT out of the park.