The ACLU founders were a bunch of liberal pacifists. One of them, Roger Baldwin was a member of the American Union Against Militarism. Crystal Eastman was a feminist, socialist, and pacifist, and don't forget Ruth Bader Ginsburg, the first director of the ACLU women's rights project. We all know what a great American she is. 
Here is a list of issues the ACLU supports and opposes. What a great organization, huh? I can see how liberal's and atheists could fall in love with them. 
The ACLU opposes: 
    The use of drug-sniffing dogs 1 
    Attempts to strengthen DUI alcohol laws 2 
    Laws restricting areas where the sexual offenders of children can live 3 
    Life sentences for juveniles convicted of extremely violent crimes 4 
    The "Three Strikes" law mandating harsher sentences for those with three felony convictions 5 
    Withholding voting rights for felons 6
The ACLU opposes the death penalty, and: 
    Claims: "The death penalty is contrary to fundamental notions of human rights. The United States is the only major country of the Western world that tolerates the death penalty." 7 
    Seeks to halt death penalty executions, 8 claiming that "death by lethal injection is extraordinarily painful and [can] constitute cruel and unusual punishment." 9
    The ACLU opposes: 
    Mandatory sentencing laws for crack-cocaine possession 10 
    Shutting down Methadone clinics 11 
    Laws stipulating where half-way houses may be located 12 
    Drug testing of welfare recipients 13 
    Federal faith-based drug treatment programs 14 
    Federal laws banning student loans to convicted drug addicts 15
The ACLU supports: 
    "Medical" marijuana laws 16
Abortion Issues 
The ACLU supports: 
    Abortion and abortion-on-demand 17 
    Increased funding for pro-abortion groups such as Planned Parenthood 18 
    Euthanasia 19
The ACLU opposes: 
    Abstinence-only sex education for students 2 
    Conscience protection rights for medical providers 21 
    Informed consent and "Women's Right to Know" laws 22 
    Pro-life state license plates 23
Immigration & Illegal Alien Issues 
The ACLU supports: 
    Government services for illegal aliens 24
The ACLU opposes: 
    Federal immigration laws targeting border security and preventing entrance of illegal aliens 25 as well as the enforcement of those laws 26 
    Denying drivers licenses to illegal aliens 27 
    Federal laws identifying citizenship status of those receiving treatment at medical facilities 28
Homosexual Issues 
The ACLU supports: 
    Homosexuality 29 
    Gay marriage 30 and benefits for gay "families" 31 
    Adoptions by gays, 32 gays as foster parents, 33 "parental" rights for gay "parents," 34 and gay parent family training 35 
    Gay clubs on school campuses, 36 gay campus publications and articles on campus, 37 and forcing straight students to attend gay sensitivity training 38 
    Gays in the military 39 
    Pro-gay state license plates 40 
The ACLU opposes: 
    Marriage between only a man and a woman 41 
    A school competition asking "students to explain why preserving marriage between men and women is vital to society and why unborn children merit respect and protection." 42
The ACLU supports: 
    Bigamy and polygamy 43 
    Pedophilia and legalizing sex between children and adults 44 
    Transgender rights 45
Religious Expression Issues 
The ACLU opposes: 
    Ten Commandments displays 46 
    Use of government facilities by the Boy Scouts 47 
    Religious symbols in public parks 48 
    Prayers at military academies 49
At the federal level, the ACLU opposes: 
    Keeping "under God" in the Pledge of Allegiance 5 
    Keeping the national motto ("In God We Trust") on currency 51 
    Faith-based programs 52 
    The observance of religious holidays 53
At the state level, the ACLU opposes: 
    The mention of God in a state motto 54 
    Prayers to open legislatures 55 
    Moment-of-silence laws at schools 56 
    Religious sales tax exemptions 57 
    Educational choice and vouchers 58 
    Prayer in judicial arenas 59
At the local level, the ACLU opposes: 
    Character cities 60 
    Mayor's prayer breakfasts 61 
    City council prayers 62 
    School board prayers 63 
    Nativity scenes 64 
    Religious symbols in city seals 65 
    Voluntary distribution of Gideon Bibles 66
In schools, the ACLU opposes: 
    Graduation prayers 67 
    Athletic prayers 68 
    Intelligent Design or any mention of creation or a Creator 69 
    Prayers at school 70 or at school events 71 
    School choirs singing religious songs 72 
Miscellaneous Issues 
    Opposes library policies blocking access of minors to sexual content, gambling, and illegal activities 73 
    Opposes denying visas to foreigners who oppose the United States government 74
    Opposes one federal agency from sharing with another federal agency the information that it has on Arabs in America 75
    Supports anti-American foreign terrorists captured on the battlefield having the same constitutional protections as U. S. citizens, 76 even though the guarantees in the U. S. Constitution apply only to American citizens
    Supports activists disrupting military funerals and confronting the distraught family members with offensive and inappropriate language 77
    Opposes banning convicted sex offenders from having access to parks where children play 78
    Supports the notion that the separation of church and state trumps students' freedom of speech 79
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