DES MOINES, Iowa (AP) - Former House Speaker Newt Gingrich is blasting former Gov. Mitt Romney as someone who can't bring enough change to Washington.

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Speaking on Tuesday after a fourth place finish in the Iowa caucuses, Gingrich said Romney is a nice man but incapable of doing what's necessary to fix the country. He also criticized Romney for running a negative campaign.

Gingrich said the race for the GOP nomination was just beginning. He vowed to go on and said he is the candidate to create change.

Gingrich congratulated two other contenders - Rick Santorum and Ron Paul - but said he will air contrasts between himself and Romney.

Gingrich said Republicans must have a great debate before they are prepared to have a great debate with President Barack Obama.