Voters are experiencing buyer's remorse, according to the poll. Gray defeated then-Mayor Adrian Fenty in 2010, but in a potential rematch, Fenty would lead Gray, 51 percent to 30 percent, according to the poll.
Fenty has denied any interest in District politics following his defeat.
Gray would also trail former Mayor Anthony Williams, who left office in early 2007, by a significant margin, according to the poll. Williams leads Gray, 48 percent to 31 percent.
District voters have also soured on Gray's replacement as chairman of the D.C. City Council, Kwame Brown, who has faced questions about extravagant city vehicles leased on his behalf. Only 23 percent of voters approve of Brown's job performance, compared to 57 percent who disapprove.
The Clarus Research Group poll was conducted Dec. 19-21, surveying 500 registered voters. The margin of error is +/- 4.4 percent.