Between 1928 and 1932 the Nazi party saw a significant rise in support and their seat in the Reichstag rose from a mere 12 to 230 during this time. It now looked promising for the Nazis.
Hitler was also supported by a number of wealthy businessmen who were prepared to make donations to help fund the Nazi cause, this helped Hitler with his election campaigns and also fund his propaganda.
Hitler also made use of his storm troopers who attacked any Nazi opposition; many of his opponents were simply to afraid of being murdered and did not speak out against him. In many cases, if caught, the storm troopers were allowed to go free because the judges were supporters of Hitler.
A lot of Nazi support was because they had something to offer everyone, although their ideas were very extreme it seemed as though they were able to cater for everyone. Hitler also had many strong personal qualities such as his ability to have power over people; his great public speaking ability and good organisational skills made him a formidable opponent to any other party. He was also a very driven yet unstable man who had such a strong belief that it was God that called him to become dictator of Germany, this made people believe in him as well and also stopped him from giving up when anyone else might have.
Hitler also changed the Nazi party, he made the SS into a legally functioning force when they were serving the Nazi and forced them to work with the law in mind, although when they were not being used by the Nazis they were still very violent and intimidating.
When Hitler was imprisoned after the Munich Putsch he was able to rethink the Nazi party when he was released he managed to save the party from collapse which allowed people to see how much of a strong leader he was. From this he gained even more support.
In November 1932 the Nazis failed once again to gain a majority number of seats in the Reichstag and they fell from 230 seats to 196. Hitler was so depressed that his hard work had failed that he contemplated suicide but was rescued by Hindenburg.
At this point in time Franz Von Papen, who was a friend of Hindenburg, was chancellor but could not gain enough support in the Reichstag. They were both governing under an emergency decree and gave Hitler the opportunity to be vice-chancellor in return of his support. Hitler refused this offer and instead demanded that he be made chancellor, Von Papen and Hindenburg decided to take a risk and make Hitler chancellor. On the 30th January 1933 they made him Chancellor with the belief that they could control him, they were very wrong!
To conclude, Hitler had tried in the past to seize power but failed and in the end he was given power and did not need to take it.