It’s been evident for a while that Democrats have been injected with huge amounts of enthusiasm since Harris replaced President Joe Bidenon the ticket. Call it “vibes” or something else; it’s real. Polls this week reflect that.

While a Monmouth University poll from June showed just 46 percent of Democrats said they were enthusiastic about a Trump-Biden rematch, that number has nearly doubled to 85 percent for the Trump-Harris race. Democrats’ enthusiasm leapfrogged Republicans, whose excitement stayed steady at 71 percent.

In other words, Democrats went from a 25-point enthusiasm deficit to a 14-point advantage, at least on this specific question. (Other polls have tested enthusiasm to vote, which is a somewhat different question, and the two parties have been closer.)

Also notable from the Monmouth poll: Nearly 9 in 10 Democrats say they’re optimistic about the election, compared with about three-quarters of Republicans.

And an AP-NORC poll this week showed that 63 percent of Democrats are excited about a potential Harris administration, compared with 57 percent of Republicans for another Trump administration.

So what could go wrong with Harris-Walz before election day? I'm not much worried about the Trump campaign digging up dirt on them. Both Harris and Walz have run for office numerous times. It sure seems that any truly horrible stuff about their backgrounds would have come to light by now.

Plus, it seems clear that once voters form an impression of a candidate, if that person is popular, their popularity isn't going to take a big hit if some negative news about them appears. Trump survived all kinds of bad press in 2016 because voters were attracted to him for other reasons.

I'm also dubious that Harris-Walz will be hurt by policy positions they take during the rest of the campaign. Again, voters care more about the person than the policies they espouse, though single issue voters may be swayed by a policy position they vehemently dislike. 

So my biggest worry is something that neither the Harris or Trump campaign has any control over: whether a war breaks out between Israel and Iran, which likely would draw in the United States on the side of Israel.

Israel is run by Jewish right-wing zealots. Iran is run by Islamic terrorist zealots. Not exactly an encouraging situation given the saber-rattling each side has engaged in recently.

Iran says that Israel won't be attacked if a cease-fire deal is worked out between Israel and Hamas. But Netanyahu, the Israeli prime minister, doesn't want a deal, since this could mean the end of his right-wing coalition that keeps him in power and, importantly, out of the hands of justice for crimes he's alleged to have committed. 

If all-out war broke out between Israel and Iran, gasoline prices would soar owing to a disruption of Middle East oil supplies. News of the war would dominate headlines. Voters would unfairly blame the Biden-Harris administration for the war. Republicans would use the war to hammer Harris-Walz: "Never would have happened if Trump had been president."

A minor conflict between Iran and Israel wouldn't have these major effects, just some lesser ones. That's my hope, that both Iran and Israel realize that they're better off cooling things down rather than heating things up.

However, Netanyahu could want war with Iran to boost the chance that Trump will be elected president in November, since he basically gave a Republican campaign speech when he spoke to Congress this summer. And perpetual war keeps Netanyahu in power, as noted before. 

Hopefully my worry won't come to pass. It'd be super disappointing to have a Harris-Walz victory snatched away by an Israel-Iran war.