Manufacturing may play a role in the minds of some voters this month.
The Michigan primary is today, and voters will choose their favorite candidate in Ohio on March 15.
According to Scott Paul of the Alliance for American Manufacturing, these states have a bigger share of their economy in manufacturing that most other states.
"In fact, about 20 percent of the economy in Michigan is in manufacturing," says Paul. "About 16 or 17 percent of the economy in Ohio is in manufacturing, which is a pretty good chunk considering the nationwide average is about 12 percent."
As a result, Paul says anything that happens in manufacturing has a greater impact on states like Michigan and Ohio than it might elsewhere in the country.
Speaking of manufacturing, the industry took another one on the chin in February in terms of jobs.
"Despite pretty vigorous job gains overall, manufacturing shrunk again in February," says Paul. "It lost 16,000 jobs in an economy that gained almost a quarter of a million jobs, (and) that right there kind of tells you that, while some people are finding work, those in the goods producing sector of the economy like manufacturing and mining are having a much more difficult time."
Paul chalks things up to the trade deficit with countries like China, as well as currency manipulation.
The issues have been talked about for years, even before Mitt Romney and President Obama debated the issues in the 2012 presidential race.
"Donald Trump has the loudest voice but he's not the only voice in this, and I'll just point out that for instance Hillary Clinton went to a manufacturing facility in Detroit and did a speech about it on the Democratic side," says Paul.
"Also, Bernie Sanders did a rally in Michigan, (while) Ted Cruz and, actually, all the candidates responded to a question from Chris Wallace on manufacturing," he adds.
Paul is not sure that all the candidates have gone as far as they've needed to go on the issue of manufacturing, and how we get jobs back in this country, but he says it is a conversation that we're hearing during the campaign.