I don't get that either. Would they allow pro-Iranian mullah posters? I don't think so. Yet Putin is in bed with mad mullahs that run that country. Would they allow pro-North Korean posters? I don't think so. Yet Putin is in bed with that country, too. For some reason, there is a type of conservative that doesn't see Putin for the type of man he really is (a KGB thug who took over an emerging democratic country), the type of threat to USA that he is (he's worked to thwart US policies throughout the world in the last 8 years), and the threat that he is to our nation by either arming our enemies or by direct threats to our allies.
Strangely, Putin represents for shallow conservatives an exemplary leader with manly and virile appeal. For them, he is a Christian paladin, and pleasant, cunning contrast with the foolish Obama. These dilettante conservatives (or they're indifferent to it) like to see America harmed by Putin too, while still claiming Putin's harmless. To prove a point that Obama is foolish and weak, a point that was self-evident even before Putin came along, these Putinista delight in Putin's Russian chauvinism and his successes.
I could not have said it better.