With three weeks to go until Michigan's August 5 primary, the Republican primary race for the 37th Senate district seat has grown heated.

Rep. Wayne Schmidt (R-Traverse City) and Rep. Greg MacMaster (R-Kewadin) are facing off for the opportunity to fill the seat being vacated by Sen. Howard Walker (R-Traverse City), who declined to seek reelection for his post covering the Eastern Upper Peninsula and Antrim, Charlevoix, Cheboygan, Emmet and Grand Traverse counties.

Schmidt, a former Grand Traverse County commissioner and general manager of Captain's Quarters in Traverse City, has served in the state House of Representatives since 2008; he is term-limited from running again for that seat. MacMaster, a long-time meteorologist at TV 7&4 and 29&8, is currently serving his second term in the House and will surrender a possible third to pursue the Senate.

Both candidates offer experience representing northern Michigan in Lansing, but their visions of how to best serve the district diverge in stark – and increasingly acrimonious – ways. Schmidt, who stresses the importance of compromise in legislative negotiations and advocates for finding “realistic” solutions to Michigan's challenges, has accused MacMaster of blocking key bipartisan bills like road funding and balanced budgets and belonging to a hold-out group of legislators offering “gimmicky” counter-proposals with little or no chance of passing.

“If you ask for everything, you end up with nothing,” Schmidt says. “If I can get three-fourths of a loaf of bread and that helps northern Michigan move forward...I'm going to take it.”

MacMaster contends he is more closely attuned to the priorities and beliefs of district constituents than Schmidt and believes that is reflected in his voting record. He characterizes his opponent as a career politician who “represents the interests of Lansing” over those of northern Michigan. “Our biggest difference is in our voting,” MacMaster says. “He votes to raise taxes and implement the Affordable Care Act and Common Core standards...I vote to reduce our structural deficit and improve efficiencies in our government.”

Ratcheting campaign tensions has been the backing of MacMaster by Americans For Prosperity (AFP), the Tea Party-linked advocacy group funded by billionaire brothers David and Charles Koch. Schmidt recently slammed as “fake” and “unscientific” a poll released by Magellan Strategies for American Encore – an organization connected to AFP – positioning MacMaster with a 45 percent edge over Schmidt's 19 percent.

“With the poll results they were (claiming), I could never have even been elected county commissioner,” Schmidt says. “My support comes from northern Michiganders, not out-of-state billionaires. Those are the people I'm working for.”

MacMaster tells The Ticker he hasn't “asked for any help (from AFP) or coordinated with them in any way," and that any stumping the group is doing on his behalf is “of their own free will. Wayne is trying to muddy the waters because he can't face the facts that I'm leading in the polls. He wants to be a senator, and he's losing," MacMaster says.

Local endorsements have added further fuel to the fire. While both candidates have notable backers – including the Michigan Chamber of Commerce and Grand Traverse County GOP Executive Board for Schmidt, and key agricultural and veterans groups and NRA leaders like Ted Nugent for MacMaster – Schmidt publicly challenged his opponent's “curious strategy to seek Democratic support in a Republican primary” after Traverse City Mayor Michael Estes announced his endorsement of MacMaster in May.

“I suppose we will next see an endorsement from former liberal democrat Governor Jennifer Granholm, as they seem to have so much in common,” Schmidt posted on his website following Estes' announcement. (For his part, Estes tells The Ticker he has “not been affiliated with any political party for the last seven years,” and that he supports MacMaster because of his “convictions” and cost-cutting approach to roads and education funding.)

A campaign finance statement is due from all candidates later this month; the last reports, covering the period from August 30, 2013 through December 31, 2013 show MacMaster raised $17,000 while Schmidt raised $99,000. Americans For Prosperity state director Scott Hagerstrom told the Detroit News earlier this month the group plans to spend more than $1 million influencing Michigan primaries with ads and robocalls this summer, including the 37th district race.

Whichever candidate succeeds on August 5, he will still need to face either Democrat Phil Bellfy (Sault Ste. Marie) or Democrat Jimmy Schmidt (Central Lake) in November. Both Schmidt and MacMaster tell The Ticker that if they lose in either election, they will return to northern Michigan to work in the private sector, though -- expressing equal measures of confidence -- neither candidate says he's planning on that occurring.