I recently saw a nice analysis of why a Democrat is preferable to a Republican:
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http://anarchiststrategy.blogspot.com/2008/10/elephant-in-room.html
[..] a Democratic president means we can go on the offensive,
while a Republican means we're forced to continue playing defense.
Why? For one, we are far better equipped to take advantage of
liberal disillusionment than liberal outrage. The last four years
have been a testament to this, with the clearest beneficiaries of
outrage being the Democratic party and the authoritarian Left
(see: the anti-war movement.) While it's true that anarchists have
been building some momentum of late, the Bush years, especially
after 9/11, have not been good to us.
Liberal disillusionment has been far kinder to anarchists. The
C.S.A. is of the opinion that it is no accident that the surge of
anarchist activity in the late '90s overlapped with a Democratic
administration in the process of moving to the right. While it has
been nearly impossible to break the liberal obsession with the
current president's personality and grammar, it was relatively
easy to point out that life under a likable Democrat still sucked.
As the Clinton administration abandoned its social democratic
agenda--especially in its decisive move towards a neoliberal
economic policy--progressive liberals got involved in the
anti-globalization movement, which, due to its pluralism, exposed
some to anarchists and their propaganda. This is largely what led
to the swelling of anarchist ranks at the time and thus allowed
for the various dramatic events now immortalized on Hollywood
celluloid.
Another reason a Democratic administration favors us is that it
forces us into fewer reactionary stances. As stated in the
paragraphs quoted above, a Republican administration would likely
busy itself with all manner of offensive actions in a continuation
of the current administration's agenda--possibly at an accelerated
clip--to which anarchists have struggled to effectively
respond. Being the militant reaction to Republican offense does
not suit anarchists for a variety of reasons, from the
demographics of the anarchist milieu to the strengths of the
anarchist critique of postmodern life.