The only one I find really shocking out of those is the bottom poster...

The first one could very well have a racist base, he could also be speaking about taxpayers having to pay for these huge defecits and it being a form of slavery, so he made it short and catchy... though obviously other races pay taxes as well so it wouldn't just be white slavery, so possibly racist possibly stupid...

The second one could come across as looking kind of racist, but what the picture is showing (in an obviously exagerated kind of way) is kind of true in that obama is spending alot of money and taxes will have to pay for this...

The third one has sexual conatations, but the message in it is basically true for the last few US presidents, as in keeping Saudi's sweet... for oil rather than jewels though... though they kind be trying to infer thats he's a muslim and thus takes instruction from the Saudi monarchy (which is slightly convuluted thinking but these people aren''t usually the clearest thinking bunch...)

Number four, who doesn't like a good hitler comparison... we use plenty here in the backroom... OTT and extreme but not wacked out crazyness... Well he could be crazy but may just be OTT and extreme...

Number 5 is completely out of line...

Something to remember people usually do exagerate with posters, they want something short, catchy and in the case of these shocking in an attempt to make thier point...

Not that that makes it right, just not nessecarily a loony behind everyone...