He’s the biggest piece missing from what’s left of the 2014 governor’s race puzzle. And he has said he will decide soon whether to enter the campaign.

At the same time, US Representative Michael E. Capuano on Wednesday will also collect cash in Washington, D.C., for his congressional re-election effort. Capuano has a luncheon fund-raiser at Bistro Bis, between the Capitol and Union Station.

Federal campaign funds cannot be directly used in state races.

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After Attorney General Martha Coakley’s announcement of her candidacy this week, Capuano remains the biggest political name waiting in the wings. A Capuano adviser told the Globe the Somerville Democrat had lined up a media adviser, pollster, and fund-raising team. He met earlier this month with labor leaders.

According to Federal Election Commission documents, Capuano’s campaign committee had $478,575 in his account on June 30.

The invitation for the event, hosted by the Erickson Company, a Democratic fund-raising firm, asks for contributions of $1,000 for “attendees” and $2,500 for “co-hosts.”