A distinction without a difference. Whether explicitly bourgeois parties or not, the Nazis and SPD were both vehemently opposed to the ideology of the KPD, and those two parties received a majority of the votes in the 1932 election.

Yes, and that's why Hindenburg won and appointed Hitler.

And do, still. By the millions, in every election. Or, at least, if not explicitly bourgeois parties, parties that are based on some form is liberal ideology, not necessarily in opposition to bourgeois interests, and that often are aggressively opposed to Marxism-Leninism.

Yes, which is unfortunate and concerning, especially as the bourgeoisie tend to ally with the far-right to stop the left, which brought Hitler to power which is happening now with the CDU and the AfD, as pointed out in the article linked at the start of the conversation.