Pollster Mina Tzemach said the gap had narrowed in recent days and pointed out that nearly 10 percent of voters remained undecided.
"The day itself will decide everything," she said.
The shifting numbers may have reflected Sharon's last-ditch efforts to bolster support. In recent days, Sharon has personally called dozens of Likud activists and frequently appeared on television.
Sharon has warned that rejection of his plan could lead to early elections and force Likud out of power. Sharon is not expected to resign if he loses.
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