Polls usually favor left-wing parties now, but the Iran war and global oil prices seem to be giving a boost to the American opposition.

“Could be a huge loss of prestige for Donald Trump” How the last two years of Donald Trump’s term as the 47th president of the US will play out could very well be decided in just a few weeks when the country votes in the midterm elections for Congress. That’s because the party that gains the majority will be able to influence which policies Trump can get through.
The Republicans are therefore putting hundreds of millions of dollars into election campaigns across the country, while Trump himself is out on an intense campaign tour even though he’s not on the ballot. Watch the segment on SVT Nyheter.

Trump: Won't attack Iran before midterm elections Donald Trump says the US will not carry out any further attacks on Iran until after the US holds its midterm elections on November 3. The president states this on Truth Social.
He also writes that he has had 'productive discussions' with Iran regarding the war. See the article on SVT News.