The Nazi party were very persuasive; they would use whatever means they could to get what they wanted.
These posters are propaganda for Hitler they both have the aim of enticing the German public to vote for them but they are both different types of propaganda.
Source A is Black propaganda, saying that the Jews and the Social Democrats would both bring communism, this is what the Germans feared the most. The short, fat looking man, a stereotypical Jew, is holding a huge bag of money, is well dressed, and is obviously well fed because of his size this is to give the impression that Jews are money grabbing and selfish. Most of the Germans disliked the Jews anyway but this poster would hopefully, for the Nazi party warn even more people off, as according to the Nazis, would keep all the money for them selves. That is why the Jew is drawn as fat and wealthy.
The tall thin man represents the Social Democratic Party, the Nazis biggest rival. He is dressed like an angel but is holding a club. The club shows the threat of violence, which would warn voters off. The man appears to be kind, gentle and a good leader, like an angel, but underneath he has the threat of violence and therefore is a deceitful, liar too.
The two men, the Jew and the Social Democrat are linking arms, I think this is so that you link all the bad things about each party (man) will be linked together with each other so that the parties appear twice as bad, and therefore would warn even more people off voting for them. .
Although the poster is Black propaganda, towards the Nazis rivals, it can be seen as white propaganda, towards the Nazis, because if these people are not going to vote for either of the rival parties then there is only the Nazi party left to consider. This is a clever way to encourage voters, the voters can look at this and see who not to vote for, and therefore think for themselves and who they should vote for, and since there is only the Nazis left to consider, they have won votes with out pasting there name all over the place and boring everyone with the same marketing devices.