Donald Trump has replaced his boasting with begging just days after losing his front-runner position in Iowa and his firm lead over Ben Carson nationally.

Much of the bravado the Republican presidential hopeful has shown in past stump speeches was absent Tuesday when pleaded with supporters in Sioux City, Iowa to help him recover his edge in the earliest voting state.

"Iowa, will you get your numbers up, please?" Trump asked the crowd of about 2,500 while promising to do "such a good job" on the campaign trail if he's able to reverse his slumping poll numbers in the state.

One Republican insider says the vulnerability Trump displayed yesterday in Iowa could precipitate an even further decline in his support.

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