The speech gave a lot of buzz and the price of Bitcoin surged above $67,000 (do you think this is the reason?)
No, I do not think this is the reason for Bitcoin getting to over $67k. Bitcoin has already started correcting after what happened with the German government selling its bitcoin. Bitcoin dropped to as low as $55k earlier this month but immediately after the German government stopped selling, Bitcoin started recovering. In fact, on the 22nd of this month, bitcoin got to $68,181 and that was before the conference because the conference started on the 25th and ended on the 27th of this month. So with this, I can say the speech just coincides with when Bitcoin was already going up.
Do you think these political endorsements will help the politician to win the elections, or they will help Bitcoin's price increase?
Of course, political endorsements help candidates win elections. The more endorsements a candidate gets, the more voters they will likely get and this is also more money for the campaign. Campaigns are expensive and if you don't campaign well you might lose. That is why the two major parties in the US always win. They have better funding and structure.
I don't believe political endorsement can increase bitcoin price. Bitcoin is not a national currency, It's a global one. So an event like that of a particular country is not big enough to affect the price of bitcoin.