Immigration is the perfect example of why and how the political parties and system fail our country.
The majority of citizens, regardless of party, want secure borders and anti-illegal immigration policies. Even California passed the proposition years ago, only to have it struck down by the courts.
Democratic leadership is soft on immigration because they want the poor/illegal hispanic vote. Republican leadership is soft on immigration because big business wants cheap labor. That is why nothing has been done.
A third party could win on that, as long as it doesn't get bogged down in ideological purity issues.