It's much more effective than voting since your single vote on a jury could keep an innocent man out of jail. Whereas one vote in an election is not going to make a damn bit of difference one way or the other.
Imagine being brought up on bogas, unconstitutional charges by a illegitimate and tyrannical district attorney with a corrupt judge presiding. Now imagine the jury consisting of 4 soccer moms, 2 lesbians, 2 leftist college students, an abortionist, and 3 government employees. All because "conservatives" wanted excuses to get out of jury duty.
This very well could be describing only 4 people.