There are probably a few reasons for this.
I'd have thought the main one would be that he's eight years older and clearly in decline.
The second that he's had two attempts made on his life recently.
The third is that the security services have been on and on at him about how difficult it is to secure open-air rallies, which are his preference.
The fourth is that attendances are obviously down and people can't be arsed so much, because the set list hasn't changed. It's the same old grievance tunes.
The fifth is that there aren't really many undecided voters at this point. People know what they're getting with the Orange Shitblimp this time around.
I hope this is shaping up to be a recipe for defeat, but I still have a bad feeling about it all.