Newt Gingrich was hit with new criticisms from two of his opponents for the Republican presidential nomination Monday, former Massachusetts Gov. Mitt Romney and Rep. Ron Paul (R-Texas), as he continues to enjoy a boost from his widely praised performance in last weekend's debate.The Romney campaign launched an anti-Gingrich website that is perhaps most notable for its unsubtle web address: unreliableleader.com.The site shows a picture of Gingrich, the former House Speaker from Georgia, with former House Speaker Nancy Pelosi (D-Calif.), highlighting their joint appearance in an ad supporting legislation to curb carbon emissions and reduce global warming.