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Charles Dharapak, Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, makes his way through a crowded kitchen as he campaigns at a "spaghetti dinner" held at the Tilton School in Tilton, N.H., Friday, Jan. 6, 2012.

TILTON, N.H. — Republican presidential candidate Mitt Romney is warning his supporters not to rest just because polls show he has a commanding lead among those planning to vote in New Hampshire's primary next week.

Romney tells supporters in Tilton, N.H., that polls can disappear overnight and compared a poll and a vote to going on a date and getting married.

Romney has led in New Hampshire polls for months, and two separate surveys out Friday show him up 20 percentage points or more over his closest rival, congressman Ron Paul of Texas.

Two debates loom this weekend, and rivals Newt Gingrich and Rick Santorum are both looking to slow Romney ahead of the South Carolina primary if not in New Hampshire.