Suggested answer:
The following four items have been used as cohesive ties in the text:
in practice, they, although some.
The first of these, in practice is a lexical tie, contrasting with in theory used earlier in the text.
They is a cohesive tie in the form of a pronoun pointing back to the noun liberals.
Although is a cohesive tie in the form of a conjunction, signalling opposition.
Finally, some is a cohesive tie in the form of an indefinite pronoun, referring back to the liberals / they, i.e. there is some kine of ellipsis of some of the liberals / some of them.
Read about cohesion here and cohesive ties here.
Terminology: cohesion, cohesive tie