Kansas farmer Glenn Brunkow calls this time of year "go time."

This is when farmers harvest fields and move animals.

But this harvest season, diesel prices are more than $2.50 per gallon higher than a year ago.

Costs are rising, markets are unpredictable, and profits are shrinking.

Brunkow is president of the Kansas Farm Bureau.

He said the problems seem to come "from all directions."

This economic strain is a growing political concern for Republicans.

They have long dominated these states.

President Donald Trump is going to Kansas on Monday and Iowa later in the week.

He is trying to excite his supporters in the final weeks before the midterm elections.

Republicans are putting a lot of money into Senate races in Kansas, Nebraska and Iowa.

They are worried about voter enthusiasm.

In Kansas, Republican Sen. Roger Marshall faces a tough challenge from Democrat Adam Hamilton.

Democrats have not won a Senate election in Kansas in 94 years.

Brunkow said people often ask him a question.

Could economic frustration push Republican farmers to vote for Democrats?

He said he does not think so.

But it makes farmers less excited to go to the polls.

Don Hineman is a rancher in western Kansas.

He was a Republican state House majority leader.

He said frustration is growing among GOP voters, not just farmers.

He said farmers understand that Trump's tariffs have hurt their businesses.

Hineman said he is fed up with the Republican Party.

He is willing to consider other choices.

Debbie Geneva is 61 and lives in Nortonville, Kansas.

She said she has never voted for a Democrat.

But she is undecided about the Senate race.

Diesel averaged $6.30 per gallon across the country on Friday.

That is more than 70% higher than a year ago, according to AAA.

The USDA expects net farm income to fall by 2.6% this year.

It also expects production costs to rise by 4.5%.

The Trump administration has tried to ease the burden.

This month, Trump signed an executive order.

It eases limits on the tax-free use of red-dyed diesel.

Before that, there was a $12 billion aid package for farmers in December.

Brunkow said many farmers "thought it would be better" under Trump.

But he thinks most would still consider him the better choice.