I forget where I heard it, but I remember hearing a documentary about how after Hitler became leader of the NSDP, he held a party rally from which he explained that anti-semitism is a force that unites Germans.
Does this imply that other political movements, or even parties, were anti-Semitic in Weimar Germany?
The Nazis definitely did not invent Antisemitism. It was widespread in germany already during the second reich and can be tracked back into medieval times.
During the Weimer republic the newly won equal rights of jews and the general bad economic situation left by WW1 made many groups claim it was all the jews fault.
The NSDAP mostly united these sentiments into a cohesive ideology. But already in 1919 people made the assumption that a jewish and socialist led conspiration caused the loss of the war.
So many groups that at first didn't support the Nazis had anti-jewish ideas, for example the monarchists, while the democratic forces viewed attacks on jews as attacks on the new constitution.
So summed up: not everyone was antisemitic, but the NSDAP didn't have all antisemitic people as direct supporters. I'm not aware of any meaningful movement that had antisemitism ingrained in their core ideas though.
The DNVP. They were the biggest monarchist party and the biggest party on the extreme right before the Nazi’s showed up. However, they weren’t racialist or really believed in any of the Nazi racial theories, they were just anti-Semites. A good example is Carl Friedrich Goerdeler, who was sympathetic and involved in the July 20th Plot.