@Lustig Andrei,
I despised Johnson for that war. But, he earns the liberal tag by the following:
Designed his signature "Great Society" legislation, which included laws upholding civil rights, public broadcasting, Medicare, Medicaid, environmental protection, aid to education, and the abolition of poverty
Signed the Civil Rights Acts of 1964 and 1968 outlawing most forms of racial segregation and providing equal housing opportunities regardless of race, creed, or national origin, and passed the Voting Rights Act of 1965 outlawing discrimination in voting
Appointed Thurgood Marshall as the first African American justice on the Supreme Court
Signed the Elementary and Secondary Education Act and Higher Education Act to improve funding to schools, especially those in poor districts
Established the National Endowment for the Humanities and the National Endowment for the Arts to support humanists and artists
Created programs to tackle poverty such as Head Start, food stamps, Work Study, Medicare, and Medicaid
Presided over the first manned flight to the Moon with the Apollo 8 program