liberals should be allowed to marry.

SAN DIEGO - Is a person's politics ingrained in their genetics? A national study featuring a UCSD scientist says yes.

The highlight of the report, a gene called D-R-D-4, or as the researchers say, the liberal gene.

When a baby's born, we focus on its height, weight, gender and health.

But politics? Maybe we should add political leanings to the list?

Lead Researcher James Fowler PhD, with UCSD says, "what this is really showing is that our fundamental biology plays a role in our beliefs and these beliefs really go far beyond the current election. Far beyond the history of the united states, they go deep in our ancient biological past."

Fowler and a collegue at Harvard are serious about their science. Their research says a person's political ideology is affected by two things:

First genetics. Specifically, the dopamine receptor gene called D-R-D-4. Scientists have labeled it the liberal gene.

Second, social factors. Of the 2,000 adolescents in the study, of those that had D-R-D-4, and an active social life were more likely to be liberals.