Watch Replay: Hillary Clinton Rally in Detroit, Michigan, at Eastern Market

DETROIT, MI — On the defensive after narrowing polls show Michigan’s 16 electoral votes are up for grabs, Democratic presidential nominee Hillary Clinton will lay out her economic plan at a get-out-the-vote rally in the Detroit’s Eastern Market Friday afternoon.

Doors open for the rally at Shed 3, 2622 Russell St., at 2 p.m. Eastern Time. Clinton is expected to speak around 4:15 p.m. Eastern Time.

Both the Clinton and Donald Trump campaigns have been doubling down in states like Michigan with big electoral hauls. Michigan had been considered safe territory for Clinton — the state’s voters haven’t backed a Republican presidential candidate since the first President Bush in 1988.

Clinton had double-digit leads in Michigan polls a month ago, but the Republican party standard bearer has hit her hard on the discovery of a trove of new emails that FBI Director James Comey has said may be “pertinent” to the agency’s earlier probe of Clinton’s use of a private email server as secretary of state.

Clinton was scheduled to campaign earlier Friday in Pennsylvania, another electoral vote-rich Rust Belt states struggling to recover from the recession. To get to the 270 electoral votes needed to win, Trump has to “break the big blue wall” and win either Michigan, Pennsylvania or Wisconsin, NBC Political Director Chuck Todd said Wednesday.

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Clinton has a razor-thin advantage, well within the margin of error of most polls, according to a RealClearPolitics average, but Trump’s appeal to absentee voters in states like Michigan where it’s legal to ask for a “voting do-over” if they regret voting for Clinton shows what a scavenger hunt the scramble has been to get the 270 electoral votes needed to win the presidency.

In a four-way race in Michigan, Clinton narrowly leads Trump, 47 percent to 44 percent, according to a Fox 2 Detroit/Mitchell Poll of 887 likely voters released Wednesday. The poll was taken Tuesday night, a day after Trump made back-to-back appearances in Grand Rapids and Warren, Michigan.

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A direct question related to Comey’s disclosure of the investigation to Congress showed that alone wasn’t a factor in Clinton’s eroding support, said Steve Mitchell, CEO of Mitchell Research & Communications, which conducted the poll for the television station.

"However, the combined pressure on Clinton over the WikiLeaks, the Clinton Foundation and other problems are clearly now impacting her candidacy,” Mitchell told the television station. “She dropped 3 percent from last night, erasing the same gains she had made the night before, and Trump gained 1 percent. Clearly Clinton’s problems are now taking a toll on her candidacy in Michigan and the state is now in play.”

Photo by Gage Skidmore via Flicker Commons