lib·er·al (lbr-l, lbrl)
adj.
1.
a. Not limited to or by established, traditional, orthodox, or authoritarian attitudes, views, or dogmas; free from bigotry.
b. Favoring proposals for reform, open to new ideas for progress, and tolerant of the ideas and behavior of others; broad-minded.
c. Of, relating to, or characteristic of liberalism.
d. Liberal Of, designating, or characteristic of a political party founded on or associated with principles of social and political liberalism, especially in Great Britain, Canada, and the United States.
I suspect he means d. Would be very surprised if a. didn't describe himself also.