With Mitt Romney surging in polls since his strong debate performance last week, supporters of President Obama are vowing online to riot nationwide and even leave the U.S. should the Republican challenger oust the incumbent.

Numerous Twitter postings in recent days feature threats of street violence, often poorly worded, as collected by the Twitchy website.

For instance, on Oct. 8, John Kramer@YoungCal626 posted: “I Hope The USA Is Well Aware That If In The Event This Character Romney Wins The Election, The People Will Start A Country Wide Riot! #Power”

On Oct. 3, Tommy Pickles@ThugPickles wrote: “I Heard Mitt Romney , Tryna Take Away Food Stamps , If He Do .’IMA START A RIOT , IMA START A RIOT’”

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