With County Executive Isiah Leggett firmly in the race for a third term, the big shoe yet to drop in Montgomery politics belongs to council member Valerie Ervin (D-Silver Spring), who has yet to say whether she’ll run again in 2014.

The uncertainty has effectively frozen potential contenders. But this week, Silver Spring activist Evan Glass stepped up and launched a “listening tour” to explore a possible candidacy for her District 5 seat. According to his brand new Web site, the former CNN producer wants to “engage as many residents and business owners as possible in the coming months to better understand your needs, concerns and ideas.”

Glass, who chairs the Silver Spring Citizens Advisory Board and sits on the boards of Conservation Montgomery and Equality Maryland, was thought to be considering a shot at an at-large seat. He declined to comment Wednesday, but in a prepared statement he said:

“Council member Ervin and I have a good relationship, working together over the years for the benefit of the greater Silver Spring-Takoma Park community. As she has not yet indicated whether she intends to run for reelection in 2014, I am taking this first step to explore a campaign for County Council.”

Not exactly an “in it to win it” declaration, but it puts Glass in position to respond quickly should Ervin decide to move on. Terrill North, a Takoma Park resident and vice president of the Maryland ACLU and another District 5 name, has a campaign Web site up but it doesn’t say what council seat he’s targeting.

Ervin, a two-term incumbent who at one time was looking at a race for county executive, said Wednesday that she’d “definitely made a decision” and would reveal it soon, adding only that Glass was “jumping the gun.”

“I’ve made a decision, and it took a while to get to it,” she said.