With one week to go before the Democratic primary, Mayor Adrian Fenty could get a big boost toward re-election by digging into the 150,000 District Democratic voters who show up for presidential elections and disappear when it’s time to vote for the city’s next mayor.

Fenty has been running behind D.C. Council Chairman Vince Gray in the polls over the past month, including a Washington Post poll released Aug. 29 that showed the mayor lagging by 13 points among all registered Democrats. What the polls typically leave out, though, are those who don’t consider themselves “likely voters.”