Conservatives in 1964 supported racial inequality and segregation, as well as the war in Vietnam, which are both tragic parts of US history. Those are the main reasons why one should not vote for a conservative in the 60s.
The red state is who voted for Republican Party while the blue one is who voted for Democrats.
The House's primary charge against Johnson was violation of the Tenure of Office Act, passed by the U.S. Congress in March 1867, over the president's veto.