Being welcoming toward gays is not --- or at least, should not --- be a liberal vs. conservative issue.  As with most other things, there is the Catholic position --- neither conservative nor liberal.  Simply the Catholic position.  On whether a parish should welcome gays, the answer is clear:  the Church teaches that we are all sinners, and precisely because of that, all of us need the Church, her teachings, and her sacraments.  To welcome gays is not at all to accept or condone gay sex.  The Church's position on that is also clear.  But for those who are truly Catholic and seeking the way of Christ, the Church should always have open arms.  Maybe the better question is whether gays, knowing the Church's position, will seek salvation guided by the one true Church.