Gwinnett County is rapidly changing both demographically and politically — but it's had a history as a longtime Republican stronghold with a distrust of mass transit. The county voted against joining MARTA in the 1970s and again in 1990. It also joined other metro Atlanta communities in spiking a regional T-SPLOST in 2012.

Miller’s statements Tuesday, though, marked the first public suggestion that a formal opposition group may be formed.

A sizable pro-transit group called "Go Gwinnett" has already come together to advocate in favor of the referendum and plans to rev up its activities in the coming weeks. Organizers have suggested the group, made up primarily of county business leaders, could spend seven figures on its campaign.

And while several recent polls and surveys have suggested that Gwinnett residents have both an appetite for transit and a willingness to pay for it, even the most optimistic pro-transit folks admit that the referendum will likely be a tight one.

A formal opposition group could play a significant role in swaying undecided voters and driving turnout. The latter will be a crucial factor in the stand-alone election.

Miller described his still-unnamed group as a grassroots movement formed via social media platforms like NextDoor and Facebook. He said a few hundred folks have expressed support. They’re gathering funding for bumper stickers and yard signs and more, he said.

His main issue with MARTA and transit expansion in general is financial. He said that northern and eastern Gwinnett in particular were getting the raw end of the deal — paying new taxes to fund expansions that, in his view, largely benefit the other end of the county.

“I don’t want to pay any more taxes than I’m already paying,” Miller said.

If more than half of Gwinnett voters who go to the polls for the special election cast “yes” ballots, the county’s pending contract with MARTA will be ratified and a new 1 percent sales tax will be levied until 2057 to pay for transit projects.

Those projects will come from Gwinnett's $5.5 billion, 30-year transit plan. The possibilities include a heavy rail extension from Doraville to a new multimodal hub in the Norcross area, as well as greatly expanded local bus service; a significant network of "bus rapid transit" lines, which operate in dedicated lanes and are comparable to light rail; and several new park-and-rides and express routes to the Atlanta area.

The long-term possibility of rail being extended all the way to the Gwinnett Place Mall area also has not been ruled out.

Gwinnett and county officials cannot spend taxpayer resources advocating one way or another on a referendum; but the county can hold “education sessions” like the one Tuesday night to provide information to the public on the issues at stake.

Additional open houses will be held this week in the Berkeley Lake and Stone Mountain areas, and several more will be held across the county in the weeks before the election.

Find the full schedule here.

“We want to cover the entire county,” Alan Chapman, the county’s transportation director, said. “There are different types of improvements for different parts of the county. And there may be different opinions as well.”

That was apparent Tuesday in Buford, where several of the small number of residents who turned out were more skeptical than optimistic.

Miller said he’s “going to have people already voting against this thing” when advance in-person voting starts on Feb. 25.

Gwinnett Commission Chairman Charlotte Nash is largely responsible for making the referendum possible. Asked about the possibility of a formal opposition, she said that “every voter has an opportunity to officially register his or her opinion by voting.”

“I encourage everyone to take the time to learn about Gwinnett’s transit plan and the contract with MARTA in preparation for voting,” she said.

Gwinnett MARTA open houses

• Wednesday, Jan. 23 – 6 to 8 p.m., Pinckneyville Park Community Recreation Center Community Room, 4650 Peachtree Industrial Blvd., Berkeley Lake

• Thursday, Jan. 24 – 6 to 8 p.m., Mountain Park Activity Building, 1063 Rockbridge Road, Stone Mountain

• Monday, Jan. 28 – 6 to 8 p.m., Grayson City Hall Senior Center, 475 Grayson Parkway, Grayson

• Wednesday, Jan. 30 – 6 to 8 p.m., George Pierce Park Community Recreation Center Community Room, 55 Buford Highway, Suwanee

• Monday, Feb. 4 – 6 to 8 p.m., Lucky Shoals Park Community Recreation Center Community Room, 4651 Britt Road, Norcross

• Thursday, Feb. 7 – 6 to 8 p.m., Duluth City Hall, 3167 Main St., Duluth

• Saturday, Feb. 9 – 10 a.m. to 1 p.m., OneStop Norcross, 5030 Georgia Belle Court, Norcross

• Monday, Feb. 11 – 6 to 8 p.m., Dacula Park Activity Building, 2735 Old Auburn Road, Dacula

• Tuesday, Feb. 12 – 6 to 8 p.m., Sugar Hill City Hall, 5039 W Broad St., Sugar Hill

• Thursday, Feb. 21 – 6 to 8 p.m., Shorty Howell Park Activity Building, 2750 Pleasant Hill Road, Duluth

• Saturday, Feb. 23 – 10 a.m. to 1 p.m., Snellville City Hall, 2342 Oak Road, Snellville

• Thursday, Feb. 28 – 6 to 8 p.m., Fire Academy, 3608 Braselton Highway, Dacula

• Monday, March 11 – 6 to 8 p.m., Gwinnett School of Mathematics, Science, and Technology, 970 McElvaney Lane, Lawrenceville